I had some trouble with it crashing/resetting while viewing large pdf files. I took out the unformatted memory card and deleted the pdfs and haven't had too many problems since.
I had the same problem bob did when I converted the pdfs to doc via a free converter I downloaded. They looked alright in doc format, but when I converted them from the doc to html or mobi the formatting was screwy. It's not completely unreadable, but it isn't exactly nice either.
A few pdfs worked but the text was so tiny that it was difficult to read, unfortunately. Hopefully a future firmware update will give us some better pdf viewing options, but as of the moment I haven't found too many workarounds.. Converting has been the only workaround I've found and the files tends to format messily.
