Nick T gives some good advice on dissertations.
I have taken my own shot at this, along with Dave Schmidtz and others. (For the dissertation part, check page 21 and following)
Funny to think of Nick writing about writing dissertations. Seems like just yesterday when he was a newbie in grad school, and wrote this on his blog.... Four weeks later, Nick said I had "outed him." Blogging was a bit more outre and underground in 2004.