The rom is already rooted if i remember correctly
it's the same method I used to upgrade from froyo
and no prob dude.
P.S if you don't know TMO is pushing out an OTA so if ur with them u get a new baseband and 2.3.4 rom and I've heard it solves a lot of issues but beware if u do update u won't be able to make calls on any other roms than stock because of.the new baseband
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Powah is nuttin without control