can the n800 do word & excel?
I need a pda that handle those and watch movies?
The N800 is not a PDA, it's a Linux based tablet. Since it has no keyboard, word and excel would be a pain. There are utilities for viewing documents, but it's not really a general purpose computer. It does work with Google Docs, IIRC, so you could do docs and spreadsheets that way on it.
can a n800 handle streaming?
youtube or tv websites?
Yes. Web based stuff is the N800 target.