Multi-tasking can be easily enabled on the iPhone 3G by setting a flag in the capabilities plist, according to a tweet by cdevwill.

"wow looks like multitasking can be enabled on the 3G if you just set multitasking=TRUE on the capabilities plist in SB (N82AP.plist) "

This doesn't come as much of a surprise. Apple doesn't want multi-tasking to run less than optimally. Disabling it is most likely a choice made to keep the device from running slower. (and of course to sell more iphones...)

My vote is that this will be changed by the GM release date?

so how to enable multitasking on 3G

If somebody could register my UDID I could have a look at it for you guys? -,-

http://www.hackint0sh.org/f236/121251.htm