Welcome to the forums!
So far I've read .lrf, epub and PDFs on my 505. It seems to handle epub and lrf better than standard pdfs.
Most of the books I have already have the author and title embedded in them. If they don't, I change them before I copy them onto the reader - I use a program called Calibre to organise and transfer my ebooks.
There shouldn't be any problem buying ebooks from US sites - I've used Books on Board successfully, and I know others who use Fictionwise. And there are others.
There are tutorials on the site for how to convert books; plus there are an awful lot of public domain books available here on Mobile Read.
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