Guide shows how to get multi-touch gesture support on the Sony Ericsson Xperia X10
Right now, xda-developers posted step-by-step instructions on how to install a patch that will enable the handset to gain support for multi-touch gestures. Once you've carefully followed the directions, you can feast on things like pinch zooming in your photo album, but it's worth noting that it's not completely verified whether or not it'll be supported by all Android apps. Still, it's clearly better than nothing.
source: xda-developers via SlashPhone