Oh, if I could only afford the projector...
However, if you have a scanner, photoshop (or equivalent), a printer and a little retouching savvy you can do what I've done for a few modules...
1. Scan in/create the map - color, b&w or 1 bit, depending on how much you're willing to spend on printing it, so that it is to battlemap size (5' = 1").
2. Open it up in Photoshop and retouch out all the room numbers, secret doors, etc. Easiest to do in 1 bit.
3. Print the dungeon out on your inkjet or laser printer and cut it up into individual rooms, hallways, etc. Some of the larger rooms you may need to tape together. Heavier paper works best, but cheap'll do the job too.
4. Mark on the back which pieces go with which.
5. In play, just lay down the hallway, room, etc. as you need to. Post-it tape works nice to keep the pieces together and it's reusable.
It's great in play - fast and, of course, dead accurate. The prep time can be a bit much for the uninitiated but once you've made it, you have it forever. You can also make a bunch of "standard sized" hallways and rooms which you can re-use for the huge dungeons where you don't want to go through a ream of paper for...
Cheers!