We're not starting with DD yet for several reasons, mostly that she shows no interest. From a mom blog I read (Crappy Pictures), I read great reviews of a book called "oh crap. potty training" from a woman who is apparently a professional potty trainer (who knew there was such a job?!). What I liked about how she describes her method is that there is no one size fits all method, and she makes no promises to have your kid potty trained in 2 days or a week or whatever some of the other books promise. So I bought it and downloaded it (only available as a pdf), but I haven't read it yet.
ETA: Meant to add the link to her website so you can check it out: http://www.jamieglowacki.com/