Wooden boat plans from various sources on the web:

• Atkin & Company - Many older plans, sail and power for traditional building methods
• Glacier Boats - Great Alaskan 26, similar to Tolman Jumbo but longer and larger
  
• Glen-L.com - Plans, materials and books, Glen-L has been around for a long time. They have a wide range of designs.
• Svensons.com - Remember all those boat plans in old magazines? Well, they're all here. They may look dated and they are but they are also free.
• ClarkCraft.com - Large collection of plans for all kinds of boats, they also have materials and other resources.
• BoatDesign.net - Huge collection of links, articles and resources. Great list of boat plan links including free boat plans.
• BruceRoberts.com - One of the first collections of plans for home builders. I'd still like to build a Spray and the Tom Thumb is one I'm looking at too.
• Complete plans and photos for the Portuguese Dinghy
• Swan Boat Design - Small skiff designs
• Thomas J. Hill - Long Point Skif and other small boats

If you have other good sites we should list, post them as comments and we'll add them.