Here are some links to carnivorous plant websites that I've found interesting for all CP enthusiasts. Not only for Nepenthes.
 

Forums to Discuss Nepenthes and Other Carnivorous Plants

• Pitcher-Plants.com: Discusses Nepenthes and other carnivorous plant information with hobbyists growing the same plants. Most of the leaders in Nepenthes cultivation drop by and discuss their plants. I think it is the best one on the Internet.
•  International Carnivorous Plant Society (ICPS) forum:  A great forum very similar in look to the Pitcher-Plants.com site. It is relatively new as of 2007 and many growers from other forums drop in as well. 
• Pet Pitcher Forum: Discusses Nepenthes and other carnivorous plants. Very similar to the Pitcher Plants.com forum with many of the same members that participate there as well.
• Flora Nepenthaceae Nepenthes Forum: This forum is on Leilani's own nursery website. It has moderators that discuss Nepenthes cultivation using different techniques as well as threads for identification, posting photos, and discussion of just about everything Nepenthes. The site also has a catalog of Leilani's own hybrids and Nepenthes from the nursery. 
• CPUK Forum:An excellent discussion forum for all kinds of carnivorous plants. Originates from the United Kingdom. Very similar to the discussion forum at Pet Fly Traps.com
• Terra Forums: One of the first forums on Nepenthes and carnivorous plants. 

Photos of Nepenthes in Cultivation or in Nature

• Carnivorous Plant Photo Finder: One of the best on the internet!! If it isn't here, it probably doesn't exist!
• Wild Borneo Photography: Photos of animals and Nepenthes by Ch'ien Lee. Top quality photos available for purchase as well
• Photo Gallery in Japan: Photos of Nepenthes from a private collection in Japan. Site is in Japanese but plant ID is in English
• Nepenthes in the Wild: Part of the Pitcher Plants forum. Photos of Nepenthes in the wild taken by hobbyists or locals. Very cool!
• Carnivorous Plant Database: All kinds of photos and  information on all CP's not just Nepenthes.
• Borneo Exotics Gallery: Borneo Exotic's own gallery page showing photos of Nepenthes
• Carnivorous plants in their habitats: Dedicated to showing Nepenthes and other carnivorous plants in their native habitats.
• Leilani Hapu'u Nursery Gallery: Leilani's own gallery of their cultivated plants at the nursery.
• Exotic Plants Plus Gallery: Tony's photos of his cultivated plants.

Photos of Nepenthes with Cultivation Information from other Growers

• Plants with Attitude: Information regarding Nepenthes cultivation with photos.
• Nepenthes for Everyone: Hobbyist's site located in Australia with loads of information and photos dedicated to cultivating Nepenthes
• Captive Exotics Nepenthes Cultivation: Excellent Nepenthes photos and profiles!
• Nepenthes in Cultivation: Photos of many Nepenthes grown in terrariums with growth information on each plant.
• Pitcher Plant Fever: Nepenthes website with photos and other information about cultivation
• Wikipedia: On-line encyclopedia with loads of Nepenthes information.
• CP Jungle University: hobbyist's page with a lot of Nepenthes cultivation and history information
• Malesiana Tropicals Cultivation Guide: Malesiana Tropicals cultivation guide for Nepenthes

Carnivorous Plant Society Pages

• International Carnivorous Plant Society: An excellent source for information about all types of carnivorous plants and conserving wild habitats where they are found.
• Colorado Carnivorous Plant Society: More information and photos of all kinds of carnivorous plants.
• New England Carnivorous Plant Society: Site in the northeast dedicated to all kinds of carnivorous plants and cultivation.