Lonely Planet - SubWWWay - Sweaty Socks and Lycra Jocks

SubWWWay - Sweaty Socks and Lycra Jocks

The Hiking and Walking Homepage is an excellent source of information on hiking spots around the world, hiking tours, equipment, clubs, hotlinks and more.
It's gear galore at TrailWalk. These UK-based pages review all the latest gear available to hikers - still under construction, but looking good.
Backcountry Home Page is an idiosyncratic grab-bag of stuff about getting the most out of getting off the track.

So slick it doesn't leave bubbles: e.Dive Travels.
Virtual oceans, scuba humour, bulletin boards and dive art: Scuba Central has the works.
If you're serious about scuba, Scuba Diving Explained has more detail than you can poke a flipper at, as well as some odd links.

Links galore at the International Bicycle Fund. Every aspect of two-wheeled travel explored, with a particular focus on Africa.
Trento Bike Pages is a handy guide to cycling through Europe. There's also a good links page.
Cyber Cyclery pins down an astonishing number of links to cycling sites around the world.

The Mountaineering Resource and Information Guide gathers together a number of Internet resources of interest to the mountaineer.
It's seriously Amerocentric, but Views from the Top magazine has plenty of info on where to go, what to do, and what to lug along with you.

AMI on the Snow has ski and snow-boarding reports for North America and Europe, as well as snow news and a party line.
After a cold, wet day on the slopes, you want somewhere nice to put your feet up and rest your chilly head. iglu.com has a great big database of ski accommodation right across Europe.

GORP (aka Great Outdoor Recreation Pages) celebrates outdoor activities and destinations, from caving to wildlife refuges, as well as related expeditions, essentials, equipment, reading matter, clubs and travellers' tales.
Out There Hyperactive is a South Africa-based adventure travel mag. Features change weekly..
Outdoor Resources Online is a great list of worldwide links covering backcountry areas, climbing, fishing, mountain biking, surfing, snowboarding, skiing, windsurfing, kayaking, scuba diving and sailing.
Sherry Mayo has a great list of Caving Sites.
Caves and Caving in the UK has an extensive listing of speleological hotlinks around the UK and the rest of the world.
If you're into yachting, Out of Bounds will really float your boat. Watch the crew of Out of Bounds as they circumnavigate the globe - plenty of photos, videos and technical details.