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I'm not getting rich yet, HA! but it's nice to see some income for writing that doesn't have a lot of overhead.
I've found Smashwords to be very good to work with. They take a reasonable cut, considering that if you get the format set up the way they want it, they will convert it into formats that work for HTML, JavaScript (beta), Kindle, ePub, PDF, RTF, LRF, PDB (Palm), and plain text.
The ePub format works with Apple iPad/iBooks, Nook, Sony Reader, Kobo, and most e-reading apps including Stanza, Aldiko, Adobe Digital Editions, and more.
If you get the format correct and are placed in the Premium Catalog, your book will appear on the Smashwords site and also on Apple, Barnes & Noble, Sony, Kobo, the Diesel eBook Store, and perhaps more.
I highly recommend them. The first effort at formatting can be daunting, but I've written a guide to ease the process. How to Format a Book for Smashwords