I have taken it for 2 semesters at school and it is almost summer break so I don’t want to forget it all over the break.
Mainly I have been listening to German music on youtube. I like Dschinghis Khan but I can’t always understand it all or any.
wie kann ich besser Deutsch lernen?
Get movies in german - I can recommend the directors cut of Das Boot, Die Wannseakonferenz, Die Bruche. Also, head over to youtube and surf the additional german vids on the right hand side of http://www.youtube.com/watch?v=qK_YTeN-PDE&feature=fvsr, if memory serves there are several on youtube of tours of helicopters with german voiceovers. Also there are some Rammstein interviews on youtube conducted in german. Not sure offhand if you can do it, but there is a lot of german stuff on youtube, but I wouldn’t know how to specifically surf for stuff exclusively in german. You could also perhaps try some voice over internet communications program that lets you put your address up as available to chat, and find some germans to chat with.
Slam your fists on tables, podiums, etc, while you talk and occasionally pause to point your finger over the heads of your audience.
Don’t know where you live, but often you can find organizations like German/American clubs where people speak German and meet at restaurants, etc. Granted, they might be a tad older than you, but still - if you just want to practice your German.
Here is a website you can go to that is similar to SDMB, but in German.
Anything that I can do in French, I do. (eta: I know you’re talking about German, but French is the one I’m working on right now) My cell phone and iPod are set in French. My facebook language is French. I read French books if I can get my hands on them. It’s not perfect, but it does help to sort of just set my thinking to “bilingual” a bit. It does work well with things I use often because it’s to the point now where I hardly notice it’s not in English.
I also watch movies I know and love with French dubbing. It helps to already kind of know what’s going on so that I don’t get distracted by being confused. Often, I put French subtitles on as well- this may not be necessary in German because spoken German is a lot clearer than spoken french (I’ve taken both), but it helps if they’re speaking way too fast. Subtitles in English are no-go, though, because then I look at the subtitles too much and tune out the French if it gets difficult, plus I get annoyed when the spoken French and the English subtitles say different things.
You forgot the more important part…
As for real suggestion, listen to a lot of German stuff, and try finding someone online to talk to, or at least chat at. My sister did this with Spanish, and has kept her ability up for years.
Have you discovered Wir Sind Helden yet?
Find some simple books in German (appropriate to your skill level) and force yourself to read them, even if it’s slow at first.
Bookmark this link for pretty good translations, this seems to give the most comprehensive samples, is much better than my expensive Oxford German-English dictionary, and also features clips of pronunciations.
Check out my thread on Bizarre videos, which all happen to be German.
Go to this site for Learning German at Deutsche Welle.
Some other good movies in German that I’ve seen recently or want to see:
Sophie Scholl - Die letzten Tage (Sophie Scholl - The Final Days)
Das Leben der Anderen (The Lives of Others)
Lola Rennt (Run Lola Run)
Das weiße Band (The White Ribbon)
Der Baader Meinhof Komplex
Maybe watch with subtitles the first time, then try to watch it without
Read German books?
Listen to The Wise Guys. They’re an a-capella band with witty lyrics. A bit of help from dict.cc should give you enough of the ‘gist’ of a song that you can enjoy it, and then you’ll start noticing more and more humour within the songs as your language skills pick up.
Two of my favourite songs, both of which are pretty easy to understand:
Nur für dich (about a break-up, very simple sentence structure throughout most of the song.)
Denglish (a tongue-in cheek song about English words creeping into German language).
Others that I found enjoyable even with pretty limited Deutsch:
Einer von den Wise Guys (the perils of fame)
Kinder (‘Kinder find’ ich nicht so toll, tut mir wirklich Leid’ - that pretty much sums it up)
Because of the nature of being a-capella their lyrics are generally very clear.
I actually think listening to them as a non-native speaker is in some ways more satisfying because of that 'aha! 
’ when a phrase clicks!
Also (and I should follow my own advice here), you might want to get into the habit of browing the German language forums here: http://forum.wordreference.com/forumdisplay.php?f=18. It’s a great resource for when you’ve got a language question of your own, and every time I visit I end up browsing a few more topics and thinking ‘huh I should look at this site more often’.
Three months in Mexico did more for my Spanish than the decade of scholarly study that preceded it.
Go to Germany.
If you want to improve your reading comprehension and vocabulary, I second the recommendation to read German books. Start with children’s books and work your way up through young adult to adult books. It helps immensely to have the English translation nearby in case you get stuck on a tricky bit of vocabulary or grammar. Just be careful not to rely too heavily on the translation or you won’t learn anything.
Take away his Liederhosen and hit him with a rolled up newspaper.
Go to Germany.
I am also trying to learn German and I have found a wonderful set of lessons on youtube. They have a series of at least eight (that’s the one I’m on). You may be a little more advanced than that but I think the series is pretty extensive.
I think that I am going to set my facebook language to German, or at least try it out. I was in Germany for about two weeks and while there I used facebook in German and found it easier than I thought it would be which made me feel better about the amount of German I knew. Also, during my travels I did pick up a little German, but mostly the people I spoke to wanted to speak in English in order to practice their English! ha!
Also, I am looking for a good online translator. I have been using the one on my Mac but sometimes I think that the grammar is not correct. Any suggestions? Note: I don’t want to pay for the online translator.
Anyway, I know a little German. And there he is over there!
(Points to midget in lederhosen.)
You’re a student, perhaps can’t afford to go to Germany? If not go talk to the Germans who have come to your area.
Look for a German expatriate club in your area. If there isn’t one find an international club and look for the Germans.
Date a German girl. Just remember to kiss her before she crushes you.