AFAIK mate, you get back to recovery by holding Vol down while powering on and you should see a choice for recovery, i used clockwork mod and that is how i get back to it, you dont need unrevoked any longer mate, to install a new rom you want to download ROM manager from the market, you can then flash a new rom while walking to the shop (its really that easy, i did it the other day!!) also down load titanium back up from market
1. d/l the rom you want
2. put it on SD
3. do a titanium back up (all apps and user data)
4. go into recovery (like i said above)
5. Do a nandroid back up (you will see the option within recovery)
6. flash Radio, then ROM (specific to developers install instructions)
7. reboot
8. restore with nandroid back up and titanium back up(if it has gone from your phone, dont worry, re down load it and do a full restore of apps and user data)
9.......... There is no 9 as far as i can remember.......
Im sure i have that correct, someone please correct me if i have made mistake???