sum already mentioned, that i use, skyfire, shootme, astro file ?, twitter, fb, tv guide
sum i didnt see mentioned is engadet, which also has widget
here i think this is nice, keeps me up to date. the weather channel also has a widget w/ radar, now, hr, 10day look. also the xda app, opera mini5, and the craigphone
here are all good
i also use sms popup
here gives a nice pop up when you get text which option 2 quick reply w/in popup window, nice