There are lots of poems at:
http://www.sanjaal.com/nepalipoems

I am one of the editors of this section. We have already entered around 2000 poems, and we are publishing 2 or 3 poems a day. We already have collected hundreds of electronic copy of the poems by old and new poets, but they are in traditional fonts like Preeeti. We are currently translating them to unicode format.[ See the tool we developed for this]

There are several other websites where you can read Nepali Poems. A list of the websites that we have collected are located in our link directory below:

http://nld.sanjaal.com/links.php?c=20

Hope you find the info useful.