While looking around for links to add to my e-reading section, I stumbled upon these posts about putting manga on the Sony E-Reader. They feature the PR-500, but the current, less expensive version, the PR-505, is essentially the same. These include an extensive comparison of color comics, scanalated manga, and Tokyopop manga available through Sony’s store. There are also links to a conversion guide to convert scans to a format optimal for reading, and Manga2Ebook, and RasterFarian, programs used in the conversion guide.
Here are some videos as well, showing manga on the E-Reader:
You won’t have to turn your head sideways for this one: