"But I Digress" is a collection of Peter David's columns for Comic Buyer's Guide, from the early 1990s -- the first few years he wrote the column. Reading them in 2001 creates an interesting time-lapse effect, especially when he refers to the "recent" creation of Image, or the "recently concluded" Gulf War. Some of the columns are a bit dated, while others are more or less timeless; even the dated ones are worth reading, for a glimpse at the comics industry in the early ninties.
David has a marvelous sense of humor, and an eye for stupidity and inconsistency. His columns are entertaining, even when I have very little understanding of his subject matter. (Hey, I was only nine years old when these were current! What did I know back then?) He also explains his subject matter, which is very helpful. Looking back, it's interesting to observe which of his opinions and predictions were accurate and well-founded, and which weren't.
Basically, this is good entertainment, with information about comics writers, artists, publishers, and fans in the early 1990s. It's also a good, though indirect, look at Peter David. I would definitely be interested in a collection of his more recent columns.