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From The PSUPedia

• Official PSU website
• Official PSU forums
• PSUtopia
• PSO-World
• PSO-World forums
• PSU Times - fan-run PSU news blog
• PSYOU.info - mission information and drop data
• Ambition of the Illuminus blog - fan-run PSU blog that includes guides and walkthroughs, amongst other things.
• PSUJP blog - fan-run PSU blog about the japanese server

Japanese links are at Useful links (Japanese).