The fourth version of these multi-touch support patches clear up feedback generated from earlier revisions and touch not only the X.Org Server but inputproto, libXi, X Input, and xf86-input-evdev too. The multi-touch work had stalled for a bit, but Daniel Stone is back working on this code.
Multi-Touch in X.Org is to be part of X Input 2.1 and should be officially introduced with X.Org Server 1.11 in the summer of 2011. There are though some stopgap solutions for multi-touch to be found in Ubuntu 11.04 and other Linux distributions until the proper support lands upstream.
Those interested in the Git tree information for this work and the technical discussions among the open-source input developers, see this mailing list thread.