Not to ressurect an old thread for no reason, what map making software are you all using nowadays?

I'm attempting to work out some maps for a face to face game that I'm starting, using a projector for the game board (miniatures are just too expensive, bah) is a little tricky, because of the fact that I just don't have any maps right now :O

So yeah, what do all of you use? Is it simply piecing together DM Tiles in PDF form, or a separate program entirely? I'm certianly willing to spend a couple dollars if it means making quality maps ^^