T-Mobile offered the G2 online for free, so I upgraded from G1... and it's given me a reason to look for the latest and greatest apps.
Has anyone used Open Home? I've tried several searches in the market, but all I ever come up with are skins.
Google Voice... used another visual voicemail app with the G1, but the G2 came with Voice. Free voice to text, and it emails you the audio and text... it's been out a while, obviously, but I didn't realize it was that much better than what I was using.
I never looked around for mobile FB chat for the G1, but found ebuddy, which looks pretty useful with FB, AIM, gtalk, msn, etc.
I downloaded Advanced Task Killer, because sometimes killing the browser helps when it's not downloading content, but I don't really think it's necessary for battery life... not from what I've noticed, anyway. And between the upgrade from 1.6 to 2.2, better processor speed, and having the apps in memory, the load time is basically like maximizing a window.
I downloaded Photoshop Express, but I've read there are better photo apps, and I'll probably try out a few different camera apps.
Mr Number call block is my new favorite app, because some douche in Wisconsin keeps asking for Vicki and I ran out of ways to say "You have the wrong number, stop calling me"... it does a simple pick up/hang up, almost always before the phone rings (granted, when he calls now it's usually 2 or 3 times within a few minutes... yeah, that must be frustrating getting hung up on like that. Dumbass.). /rant
The other Google apps are cool... navigation and maps of course, Earth, Goggles, Sky Map... they have a Listen app for audio feeds, podcasts, and news. It also has QuickOffice, Google Translate, a couple of news feeds and social media apps... great phone.