This is the Escargot Canal Cruiser, designed by Phil Thiel of Seattle. I found it on Bryan Lowe's amazing Shanty Boat Living blog. This entry chronicles Bryan's journey building this cute boat.
This is Bill Durham's House-Punt. Apparently, this one is a bit of a mystery, but here Bryan Lowe talks about it.
This is William Atkin's Retreat - An 18' Shanty Boat Deluxe. I like the simple hull design. Here's William Atkin's site with the plans.
This is the Glen-L Classic Barge-style Houseboat. These plans come from an old skool boat design house. The boat boasts: Incredibly simple curve-free construction, Easy, quick project for anyone who can handle basic woodworking tools, and Uses ordinary materials available anywhere at bargain prices. It is reviewed in this article from Shanty Boat Living.
Here's an amazing 1899 houseboat plans that Bryan Lowe of Shanty Boat Living turned up. It is beautiful in it's simplicity. Check out this article that pulls illustrations out of a book called Woodworking For Beginners: A Manual for Amateurs. That sounds right up my alley.
This is Paul Browne's Lisa B Good, a trailerable shanty. Also described on Shanty Boat Living in this article. Here are the full plans.
Okay, whew. I think I have to go be by myself for some "private time" for a little while.