Ok, this is seriously the best $300 I've ever spent. I love, love, love this fantastic piece of technology. It's revolutionized my life, and freed up a lot of time away from my computer. I adore being able to check my email accounts, twitter, the WMBYS web site, my stocks etc. Yay for the internet fitting in my pocket!
So, my fellow iPhone geeks....what's your favorite application? I'm a newbie, so tell me your favorite thing you do with your iPhone. :)