Hell no. It took long enough to get everything I needed on Cydia to be 4.0 /iPhone 4 compatible. I'm not waiting again for Open Feint 2 and HDR photos.
will wait until iOS 4.2 and its jailbreak tool released...don't want to setup everything in 4.1 then in 4.2 again...also I don't have much confidence on geohot jailbreak tool because of the blackra1n experience...
The only thing that would probably make me update is if they release FaceTime on Mac/PC. Then I would go through the trouble of upgrading and rejailbreaking so I can talk to my friends on comps.