I apologize ahead of time if this sounds spammy.
I wanted to let you guys know of a pretty cool program. You use their page as a search engine (which is powered by google and I think ask.com), and you win "swagbucks," which in turn buys you prizes, one of them including Amazon gift certificates. It's called swagbucks.com, and I've been using it for a while to earn Starbucks gift certificates. It takes me about a month (you can only win once a day, and I forget often to use it) to earn a $5 Starbucks GC (which is 50 swagbucks, whereas a $5 amazon GC is 45). It isn't a lot, but it is easy and works well.
If you use this link, I get credit for it (if you don't want me to, just go to swagbucks.com):
http://swagbucks.com/?cmd=sb-register&rb=121492
You can also earn other ways (shopping through their vendors, etc). Thought you Kindlers might like it