Check the download episodes link for every diggnation show for some cool codes every now and then
http://revision3.com/diggnation
example from episode 22
http://revision3.com/diggnation/2005-11-24/
For a limited time only, GoDaddy.com is offering $6.95 .COM domain names to Diggnation listeners. Domain transfers and renewals are included in this special price also. Use code PRAGER, that's P-R-A-G-E-R, when you place your order. And, here's the good part, the first five people to order using this code will get a GoDaddy.com T-shirt. The 50th customer gets $100 in Go Daddy domains or products. This offer will expire on December 10, so get your $6.95 .COM today!