I have a list of links that I put together for friends visiting NYC -
A Quick Guide to NYC from Columbia University.
A list of hotels for $150 or less a night
Another link for some cheap hotels
Blue Moon - Not a cheap hotel but the rooms are gigantic and it's a very entertaining place to stay if you love NYC history.
Hostels- a list of hostels.
Information about the subway.
Hopstop.com- a website that can help you with subway directions.
Menu Pages- a website that lists a bunch of menus & reviews of NYC restaurants. You can sort by price.