Seems Google doesn't want to fight against Apple's iPhone multi-touch patent (as Palm will do it to keep its Pre's multi-touch technology), they already dropped multitouch support from their Android platform.

Android Community wrote:

Multitouch support was dropped from the Android platform, and therefore the T-Mobile G1, after Apple requested it not be included.  That’s the latest rumor, apparently confirmed by an unnamed Android team member, who described the arrangement as an attempt by Google to avoid the IP aggression we’ve recently seen between Apple and Palm.

While the G1’s capacitive touchscreen certainly recognizes multitouch input - as recent hacks have demonstrated - and earlier builds of Android code included what’s believed to be Google-written, but subsequently disabled, multitouch support, the functionality did not ship in the released device.

[via Android Community]