I love it when things are simple.

You know how fanfiction.net is an evil place? And one of the reasons is that it's horrible to read fic there, but if you want it on your ereader you have to cut and paste and stuff?

Fan Fiction Downloader

It will download multiple chaptered fics from ff.net (and a few other sites) and throw them into mobi or epub or pdf files, all formatted and everything! I've tested one and it works! (Well, it seems like it works - haven't read the fic all the way through yet.)