They used to do "Previously, on Angel..." bits before each episode, so even if you missed something, it was fairly easy to be brought up to spped. Don't know why they stopped. Though it's not officially in syndication, a few networks have started showing reruns on a weekly basis. TNT does this I believe, as does my local Fox affiliate. Also the first and second seasons are on DVD.
Here's a fairly good site for info:
http://www.chosentwo.com/angel.
