Wil Shipley, the entity behind Delicious Library, has a hilarious (and informative) talk on why he develops software for the Mac-- and also netted $54,000 from Delicious Library on the first day with zero advertising.
How to Succeed Writing Mac Software (176kb PDF)
One of the funniest and most oddly inspiring things I've read in a long time. Highly recommended.
(via Steve Makofsky)