Neat Random Inn Generator
It creates a random floorplan using image segments, so you'll have to screenshot the website if you plan on saving a particular layout as a single image. It also generates a menu, including prices, which I think adds a lot of personality to the otherwise bare floorplan.
There are controls to fix certain properties of the generator in place, making it less random, so you can control things such as secret doors, inn size, and second floors. In the future there are plans for adding generated NPC staff and patrons, and even plot hooks.
Ameron over at Dungeon's Master just wrote a post Tavern Trappings as a guide for how to fill a tavern with everything else. It compliments the random inn generator well.
If I ever GM a game someday I think this would come in handy.