synergyc from easy debian is working on my n900 (binary is attached, if you need it).

However I can not figure out how get maemo to display a mouse pointer at all times (and solutions proposed in this do not work). Makes it a guessing game if the application doesn't show a cursor... but keyboard works fine.

And you need to keep the screen lit (i.e. with the brigthness applet), as synergy doesn't keep it awake.