One of the reasons why the tv out probably has never been even thought for n800/n810 has been that the omap1 and omap2 lcd controllers have been up to 640 rez only->there has been the need for external lcd controller. Now, omap2 at least has tv out on the chip, so it would have been pretty easy to add the tv out. For the epson chip it's not a possibility.

e.g. n95 has tv out. it also has the same processor as n810. Anyway, n95 is pretty nice console all by itself with snes emu and picodrive when used with tv out.(and nice portable one without the tvout)