I learned that you do NOT want to drink sugarcane juice out of a can. That is the last time I pick up something to drink at the Asian market where I can’t read the can and am not quite sure what the picture is.
I learned today that if you dont update Windows XP, your computer eventually lashes out and makes you update them.
That’s a good question to take seriously. I’ll probably be more conscious of it for the rest of the week; everytime I pick up on something I’ll think “there’s my thing for the day.”
So today I learned a few things about life outside of America from that “Weirdest things about America to non-Americans” thead (and too many other things on this board to mention), some more stuff about Gray Davis and the California governor recall (inevitably, as it’s a top story), what my keyboard looks like taken apart (I learned that it was hairier than a crotch but not how), how to setup an FTP server on your comp, and what anti-freeze looks like when it’s leaking out from your car.
I’d probably have more interesting stuff if I had the foresight to be making mental notes today.
I learned that Perry Como does indeed rock. Especially when singing Papa Loves Mambo, Right now, I’m listening to Some Enchanted Evening and I feel all sleepy and warm and happy and other mushy stuff like that… He’s quite a wonderful singer.
Today sadly I learn’t that cats do not get up after being hit by a car.
Learned the difference between diabetes insipidus and diabetes mellitus. And I’ve been a medical librarian for over 20 years!
I learned some kanji characters and their derivation, which brought the somewhat disconcerting awareness that “kagaku” (chemistry) is written by combining the characters for “study” or “science” and the character for “change”–which is represented by a stylized person standing upright followed by a stylized person fallen with his feet up in the air. So, to a novice like me, the word appears at first sight to mean “the science of making people fall down”.
Well, at least it makes it easy to remember.
Today I learned that although the websites of the main credit bureaus all say you are entitled to a free credit report in some cases, you cannot get it through the website. Nor do they tell you how to get it by mail. In each case the only way is to call the number and a recording will tell you how to get it by mail.
I learned not to wash an old crappy pillow. With the hot weather and me being sweaty my pillow was getting stanky, so I decided to throw it in with a load. Ten hours of drying later, I figure I spent more on electricity than the damn thing was worth.
I learned that the guy who created Atari (or at least created games for it, the details are fuzzy to me) also created the Chuck E. Cheese franchise.
[size1]I even thought of this thread when I read it![/size]
I learned that while giving a monthly self breast exam one should feel the lymph nodes around the collar bone. Any swollen lumps around the collar bones are bad news.
P.S. My collar bones are mercifully lumpless.
Location of the Outlook mailbox repair tool in XP. I need a vacation. 
Mine weren’t, once, in 1996. But it’s not the worst of all possible news. If you do have them it’s likely Hodgkin’s lymphoma, a cancer with a very very high remission rate (I think it’s 85 - 98% now, depending on the initial staging) after treatment.
Today I learned that Tabasco® comes in a chipotle flavor now! And you can request a free sample of it through the website. I’m drooling just thinking about it. We actually had a Tabasco® sales rep at our office cafeteria today… so I guess I also learned that Tabasco® sales reps make office calls. Who knew?
How to get the images off my digital camera onto the computer. Yay!
Awww! I’m sorry 
I learned high D, D#, E on the Tenor Sax. I also learned that I’m great at math, and I always thought I wasn’t. Learned how to export data and table structure from SQL Server 6.5.
I’m sure there’s much more.