Right now I only have ePubs and LRF files on my 505, and I am using about a quarter of the 200mb storage space with about 150 books. For a while I had my back issue collection of Make Magazine on the SD card, which was about a gig (BTW, Make Magazine has an awesome option, for $5 extra a year, you can view the latest and all back issues online, as well as download DRM free PDF copies). What I've pretty much done, is add books as I want them, read them, and not remove them. Only time I've removed them, is if A: Formatting, typos, etc were bad enough to make me not want to continue reading or reread or B: in the case of PDFs did eat up the space in a hurry.
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