sbsettings - no real reason to change anything as its working fine
yourtube - no interest
tethering - already can do on 3.0
iBluetooth - one headset is enough anyway I never use it
Hmm - still cant find a reason to jailbreak my factory unlocked iPhone 3GS other than the inane reason to say - I have a jailbroken iPhone !!!
So its not for me.