At work I managed to find an LCD monitor destined for the skip whihc had analogue video in - The N900 is now hooked up to that all day on my desk with Twimgo running - works and looks great! Install the TV Out widget to be able to adjust and optimise the display!

I would stick with Maemo...

Install the CSSU, Open Media Player, and Kernel Power 49, and you can then overclock it to boost the speed and make the device smoother, at the same time as fixing several bugs, and adding enchancements.

What ever else depends on what you want to do, but this forum's search is you're friend, and unless it is seriously left field, someone's probably already had a go..