Beezy, to you and Gbhil...thank you. With the guide here and a little hand holding from a friend, I finally got my Hero rooted last night and it's cooking!
Basically I'm running your 2.1 opt 4, with Expresso and the Newlivewallpapers and clockfix app. Everything is smooth sailing, even my market works. Except for 2 things, and I'm curious if they are fixable (my apologies if I've missed a fix elsewhere).
1. Data network seems a bit intermittent. I'm in a strange area, right on the edge of 3g coverage. Before, I could choose EVDO only and get about 700k up/down no issue. Rare I switched though because I couldn't receive voice calls or send/receive SMS. Otherwise by leaving my phone on hybrid, 99% of the time I'd run on the 1X network and have no issues connecting, just slow as expected. Now, I'm on 1X network as always, but it only wants to connect about...60% of the time it seems. Primary issue is Google Nav there, while driving.
2. The sound is intermittent as well. I haven't tried podcasts yet, but in the default music player (would it help to reinstall MixZing? Was trying to keep clean for now) it seems to occasionally drop the audio. Not running on headphones, just on the speaker.
Thanks for any help - amazing work.
EDIT: One other small issue I've come across is a kind of choppy connection by USB. Once I choose "charge only" etc., it seems to forget and re-prompt me sometimes, when I open/close a program, or perhaps on wake, etc.