I read that a long while ago and thought it was very profound.
I read it recently and was appalled at my former self for falling for such gibberish.
That scream of horror and embarrassment is the sound that rationalists make when they level up. -Eliezer Yudkowsky
The best I can say of God's Debris is that Adams is at least asking the right questions. Unfortunately the book is too ready to offer its own completely bogus, hypothesis-privileging answers.
EDIT: On rereading my comment I feel that I haven't emphasised the awfulness of God's Debris enough. It's probably actively harmful to read it.
God's Debris is for people who "enjoy having their brain spun around in their skulls." I think I can safely assume that this descriptive of a larger proportion of LessWrongians than the average population.
Without going too far into depth, I will say that it is one of the more enjoyable reads I've had lately, the philosophy the main character espouses is coherent and astoundingly seductive in it's simplicity - even as it requires you to tilt your head and squint a little to see it.
Scott Adam's God's Debris