[QUOTE=Tabby_Cat]
This is something that I hate to admit, but I recently bought a Britney “best of” Album and realised that.. I actually liked many of her songs, but never realised that she sang them, for example, “Stronger”, “Sometimes”, “Lucky”, “Overprotected”, “Not a Girl, Not yet a Woman”.
and then I bought a Madonna “best of” CD, for old times sake, I thought (the last Madonna album I have is the Immaculate Collection, for reference) and realised that.. “Music” is JUST the song which I found strangely addictive, and I never knew it was from Madonna. Same with the cover of “American Pie”.
Coming from a diet of eclectic music, it seems bizarre to me that I should be so attracted to a whole lot of music that I never thought I would like.. but I do. So, tell me about popular music. What have I missed in the last 10 years or so?
[/QUOTE]
It’s ok, it’s ok. You only THINK you like this. Come over here where the good music is. 
Seriously though, Britney isn’t my bag, but if you do like that sort of dance pop check out Justin Timberlake’s last album produced by Timbaland. It is upsettingly good.
Mostly youtube links follow: Less dance poppy, but still fun upbeat poppy.
I will also throw out the ubiquitous nod to LCD soundsystem.
I love Bloc Party take a listen.
I also love The Futureheads
Do you want something other than dance pop too? What is it about the dance pop that you like, the sheer fun and simplicity, the dancability, the beep and whirls of the electronic backround music, something else? I am happy to help you find other stuff too. (Sorry the hipster inside of me makes me want to tell you to run, the music lover in me is trying to bash the hipster’s head in. Still the hipster might be winning.)
And throw you a link to www.allmusic.com and www.pitchforkmedia.com so you can start reading some thoughts on what you have already listened to, and who else is doing stuff in that vein that you might like.
You might want to check out some older Rilo Kiely or Death Cab for Cutie. Maybe the Killers, or MIA. You might want to check out the Pippettes. There is a lot out there. A lot of it is very different, but still the same basic idea.