RPGplaneMapMaker is a free Photoshop Action Set. All is explained clearly here. You can't go wrong with this.



http://www.youtube.com/watch?v=Oe3hXxgNIw8
http://www.youtube.com/watch?v=D9-PuSM8L6g&feature=fvwk

download link in description

"RPGplane" tablet App coming on February-March 2011

Dungeon Painter Online, it's really cool.



- No downloads, installation or registration required.
- Simple interface
- Wast selection of objects and textures
- Layers and groups
- Export to png and jpg
- Maps sharing through online gallery
- Export to multipage pdf for print
- Special black & white collection for print
- Tile categories & subcategories with preview
- Square and hex grid
- Hotkeys

Here's sample map I've done in a few minutes.