5 links
Heroes and Henchmen
heroesandhenchmen.com
House rules, character write-ups, campaign background, and game logs.
Mutants & Masterminds HQ
mutantsandmasterminds.com
Official game site. Features Freedom City campaign background, previews of upcoming supplements, and a message board, as well as FAQ, errata, a mini-adventure, and maps.
Talon Studio
members.aol.com
Features information on Steve Kenson's game design work, including previews of upcoming projects.
Valdier.com
valdier.com
Features forums, news, and characters. Includes a character creation tutorial and a guide to buying powers.