These are a few of the many BTVS/ Willow and Xander sites I visit or apprieciate the devotion. Please visit them yourself for a great look at the wonderful world of Buffy!
Willow and Xander Websites

Willow and Xander...Best Friends or More? Terry's Willow and Xander Romance and Shipping site. Role model site much?? This is an excellent site, both BTVS and W/X. ( but mostly latter, of course!) She has over a hundred fanfics, and rapidly growing. Also, she hosts several clubs. Frequently updated ^_^

How it's Meant to Be Ok, this is Rae and Palaskar's Willow/Xander Site. It has lots of ideas and 'essays' (I mean that in the best way!) about the W/X relationship. Very insightful to read. They've had over a thousand hits! They're both great authors, and I've read their stuff on the W/X mailing list.

The Very Suave, Very Not Pathetic Slayerette Site This is a great fanfiction site, for individual Xander and Willow centric fiction. It's got a some original ideas, and some special features not available on other sites. Plus, a dedication to Principal Snyder!

The Labyrinth The Labyrinth, a huge site holding more than 300 Willow centric stories. This is (the Great) Serendipity's fanfic home, and it truly is worth visiting. Quench your Willow fic thirst!

It's a Clothes Fluke!This is Cri's W/X site, and it has an assortment of Willow and Xander fanfics not found on other sites. Cri is also an author, and has written several very sweet fanfics. Do read them at her site ^_^