Seems like several people have had good quotes and one-liners scattered around recently... here's a few I ran across:

"There are two types of boats, broken ones and the ones that are breaking" - a boat mechanic

"Don't forget, a 5 gallon bucket and a scared crew is the most efficient pump yet devised."

"There are times that my boatbuilding is more like a college basketball game. Whoever makes fewer mistakes wins, and I'm on the losing team." - Eric, from the Building NINA blog.

Regarding weight savings in a small boat: "It's far more effective (cheaper and healthier) to lose the weight from the skipper, than it is to reduce the weight of the boat." - Chris Ostlind, Duckworks mailing list

"If I can afford it , it's a boat: if i can't... it's a yacht" - Bill, Duckworks mailing list

"A house is a boat so poorly built it won't float." - Jon, Backyard Boatbuilding mailing list