I configured and prepared packages of 2 programs to recognize gestures on the n900. May be useful to someone. Gestikk (python) - it has assigned one gesture: "<". You can add own gestures but only on pc and then copy ~/.gestikk/gestures.conf to maemo. Be careful, one person after installing this had to do reflash Wayv - it has assigned few gestures: CTRL + ^ - terminal, I - fullscreen, L - Flash with kmplayer. If you want more, see the /etc/wayv.conf and DEFAULT.wkey. Additionally it recognize tap/slide of the right edge of the screen like in Nemo and run taskmanager.