One interesting find I found out yesterday is that if you hook up the N900 to a TV, the video is shown on TV even if you minimise the KMPlayer (the same happens with Mediabox too... With built in Media Player this doesn't seem to work.) On N900 own display you can then do whatever else you like.

I found this cool since it is actually dual display support where each display show different content. Actual use case may be when travelling with kids you can play cartoons on hotel TV and keep browsing internet on N900 at the same time!

EDIT: Now after updating to latest KMPlayer version the task switcher is not visible when in Video player. Kind of workaround is to press Camera button to get the task switcher show up.