Epinions: Mountain Bikes  
   Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.
   http://www.epinions.com/otdr_Bicycles-Mountain_Bikes

MtbREVIEW: Product Reviews  
   Reviews of mountain bikes and components.
   http://www.mtbr.com/reviews/

MSN eShop: Mountain bikes  
   A shopping site which also mixes in consumer information, including decision tips, product types available, and features to consider.
   http://eshop.msn.com/marketplace.asp?catId=580&pmpType=1&pcId=634

eBuying Guides: Where to Buy Mountain Bikes  
   Concentrates on where to buy and shop for products, but also has staff-produced buying guides for over 200 products. Some of the guides are links to other buying guide sites. Accepts no payments for listings.
   http://www.ebuyingguides.com/where/mbike_w.htm

eHow to Buy a Mountain Bike  
   How-to centers that give consumer information, shopping advice, as well as how to do things such as projects.
   http://www.ehow.com/ehow/ehow.jsp?id=13761