Any ideas or information about self-publishing?

Bill Lytle of Lincoln is looking for information on self-publising. Do you know anybody who's used XLibris, PublishAmerica or the like? Geoff, would Grub Street be able to give him any information? I suggested he Google and get opinions on the various vendors; some of the online discussions can be rather...lively. He's at 781/259-9859 and he (and I) would appreciate your calling him with your vast knowledge. Thanks. Jeanne