I don't collect links, but here are just a few that I like to visit from time to time:

The pages of Marc de Jong with informations about Sweden:

"Hiking Links" by Henk Nouws helps you finding your next hiking destination. I like the searchable trail database:

The Hiking Page maintained by Ton de Maagt has many informations on hiking in Europe:

The Potomac Appalachian Trail Club operates a noncommercial Webserver with an remarkable amount of information:

The Backcountry Home Page maintained by Stephen Johns covers many aspects of hiking, offers a lot of trip reports and other interesting information:

The Backpacker has searchable databases of trails:

CyberHikes is partly dedicated to California and worth to visit:

Utsidan collects reports in Swedish and English language: