Check out this link on the Science Fiction Writers of America (SFWA) if you are interested in self-publishing.  Lots of useful tips and further links on the options and pitfalls of print on demand (POD) and e-publishing:  http://www.sfwa.org/for-authors/writer-beware/pod/#Electronic - relevant across all genres, not just SF writers.  Lots of it is probably familiar to those of you already well on the path of self-publishing, but there are some helpful reminders there, eg ‘have a plan’.  OK, a lot of it isn’t rocket science, even though this is the SFWA site (geddit?), but it’s good to have someone tell you the obvious sometimes…