Computing
3D World - 3D graphics for beginners and pros alike
.net - For all things Internet
Computer Arts - 2D and 3D artists unite
Linux Format - Talk about everything Linux
MacFormat - Macintosh users unite!
Microsoft Windows XP: The Official Magazine - Your chance to discuss all things XP
PC Answers - Customising your PC
PC Format - PC gamers, aren't we all
PC Plus - The forum for PC Plus Magazine

Games
Gamesradar.com - The latest games chat in the gamesradar.com forum.
PC Gamer - Where PC games are your life

Technology
Hi-Fi Choice - For the discerning hi-fi enthusiast

Music
Computer Music and Future Music - Making music with technology
Guitar forums - Guitarist, Total Guitar and Guitar Techniques
Metal Hammer - Alternative, punk, nu-metal, thrash, stoner, goth and classic metal

Hobbies
Your Family Tree - The magazine to help you trace your family tree

Entertainment
Total Film - The Ultimate Movie Magazine