Rivered's aim is to stop you getting rivered. They aim to do this by providing you with articles and information online and also by telling you what poker books and videos/dvd's you should watch/read in order to improve your game and stop that dreaded river!
The Poker Source
Poker article site and guide, with focus on online poker. Nice clean design with good usability. The strong point is the 20-or-so poker articles, which are original content and has a good quality. This relatively small site is good and is recommended.
The Hendon Mob
Poker guide by a group of four UK-based pro players offering tips, a forum, photo gallery, player profiles, competitions, link guide and poker shop. High profile, attracting a lot of PR. Affiliated with Bugsys Club.