I charge my iPhone 3G about twice a day.. I use youtube a lot and text a lot all day long and I find the days that I don't use youtube are the days I only need to charge once...How often do you charge yours?

every 3 days, sometimes 2
im on t-mobile so im never on 3g
being on tmobile has zero to do with it. my girlfriend uses my first gen iphone on tmobile and constantly gripes about the battery life on the iphone. She's always texting and on facebook and crap like that though. Plus she never hits the sleep button when throwing the phone in her purse, so no telling what all gets hit when in there.
mine is usually at 10% by the time I get to bed, between texting/facebook/email/apps I use a lot of battery. Most of my battery is lost from texting I think though, i am constantly texting. Up to somewhere around 5500 messages a month