Mailing list centered around Brent Swain's Origami designs, but also with some other designers/builders appearing from time to time. Brent and his "followers" tend toward very practical, "get it done" type designs. Some good ideas on this list.
Craft A Craft covers all kinds of boats and boat building. Personally, I'm building Mark Van Abbema's V28. Check out my build log for my latest progress!