old folks like me know it. it's an old maemo thing that was there since i don't know when... i think even the first maemo version on the nokia 770 had it. it used to be in the manuals IIRC. the fact that the N900 manual doesn't include it should have been an early warning. if you like this feature, you can still vote for the closed bug. it's probably useless, but... what else could a user do?