Michael Breakfield at Mycomicshop.com highlights the Buffyverse Comics for it's "Best Rogues Galleries In Comics" series. It gives a rundown on all the usual suspects and includes must-read issues.
Angel: After the Fall @ Wikipedia. This may be the site for information on this comic. It offers plot details in addition to listing the issues, writers, and artists. It also features past and future release dates.
IDW is the company that publishes Angel: After the Fall. In the past they have published a number of Buffyverse comics, including some Spike stand-alones and other Angel books.