I love reading long fics on my Sony PRS and I love your archive :)
For new fics that I find on the net, I'm using .epubs now rather than .rtf because the file size is smaller (it's not yet an issue for me but it could be at some point) and because I had a few problems with special characters in .rtf (like ellipses and em-dashes).
I've actually written a ruby script that allows me to easily create epubs if I have the .xhtml(s) and I'm very happy with that (even though I still have to strip the unnecessary html from fics I download). The only bad thing about epubs is that the Sony reader has a bug and won't read single xhtml files over 260 kB or so, so if a fic is longer, it has to be split. (Calibre does this automatically if you set that option but my script doesn't, because I'd rather manually split into real chapters if the fic has them than randomly splitting at the end of a paragraph.)
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For new fics that I find on the net, I'm using .epubs now rather than .rtf because the file size is smaller (it's not yet an issue for me but it could be at some point) and because I had a few problems with special characters in .rtf (like ellipses and em-dashes).
I've actually written a ruby script that allows me to easily create epubs if I have the .xhtml(s) and I'm very happy with that (even though I still have to strip the unnecessary html from fics I download). The only bad thing about epubs is that the Sony reader has a bug and won't read single xhtml files over 260 kB or so, so if a fic is longer, it has to be split. (Calibre does this automatically if you set that option but my script doesn't, because I'd rather manually split into real chapters if the fic has them than randomly splitting at the end of a paragraph.)