So the gang at 37signals have launched an affiliate program for Backpack, and, of course, I've signed up. You will note the link graphic in the side bar, under the "Support" heading. 37signals is doing something a bit differently with the Backpack affiliate program: you don't actually receive cash, but rather credit toward your own Backpack account. Theoretically, your own Backpack usage could be completely free if enough people sign up for a paid plan through your referral link. You can use this link to sign up for and use the Backpack web service. The default plan is free, so it doesn't cost you a thing to try the service out. Backpack affiliates don't make a dime unless you upgrade from the free plan to one of the paid plans, which start at a mere five dollars a month. (This is the plan I am currently on.) Continued use of Backpack is one more reason I will likely not renew my .Mac subscription next year. I just wish the affiliate program had been up and running last month, when I upgraded. Then Tom, who got me hooked on Backpack to begin with, could have earned some coin. Backpack won't be for everyone, just as with any other tool, but as with any other tool, you won't know if you'll like it unless you try it.