Ok, this sounds like a shameless plug, but in full disclosure, I have no affiliation to the site/company, I just thought it was a cool site. There was an interesting article on TechFlash.com, a Seattle technology website. It was talking about a new website called GoMiles, which allows you track multiple mileage accounts from airlines, car rentals, hotels and amtrak all from one website.

They are offering 100 free invitation codes to the "beta program" to reader's of the website, with the code posted in the article, for anyone interested.

http://techflash.com/seattle/2010/06...k_gomiles.html