hmmmm let me see.... Well I hear you do not need an app killer, so that is out... but you would need a file manager, like Astro, or Estrongs, I believe. I like Dolphon Browser, for a browser.... I also make use of Dropbox, Color Note, Bump, If you use Itunes, Double Twist comes in handy, If you read news articles and rss feeds, I use my6sense, and NPR, Tuneinradio comes in handy if you like to listen to certain streaming radio stations,
If you root your EVO, titanium backup, wireless tether, Quick Boot come in handy.
there are a ton of apps out there, and I will download a few that are similar, see which ones do what I like the best, and delete the rest... I dont like a bunch of different apps that can do the same thing, lol