The Urdu Poetry Archive is probably the most comprehensive Urdu poetry site I've come across so far. It contains over 1,800 poems by about 343 poets and has an alphabetical listing of both, which makes it easy to locate whatever you're looking for. It hasn't been updated for a few years though and I hope it hasn't been abandoned - it's a fantastic resource and, since the poems are transliterated (according to a painstakingly uniform system that it's worth your while to get to know), people who speak urdu but have trouble with the script can still access the poetry. There aren't any translations up though, but I suppose that would be a whole other project.