This is a huge GW fic archive, the biggest non-yaoi fic archive out there. It's great.

Fanfiction.net
The larges place for fanfics out there. Their main site is down sometimes, so this links directly to the Anime section.

Astronomygirl18's Gundam Wing Image Gallery
This is the place I get most of my pics. She has tones, many that I've not seen anywhere else. This is easily my favorite GW pic gallery!

A great site for all anime, including wallpaper, fanfics and fanarts, music, movies, awards, whatever you want!

Want a new pet? Go catch your fav ani boy or girl at pocket bishonen or bishoujo, respectively, of course.

A very large GW site with Doujinshi, magna, multimedia, quizzes and lots of info.

Gundam Wing Archive
Another large site, but this one is mostly translated stuff, Blind Target, some Manga, as well as info, ep guid, character guide etc.

MP3s
This is actually only one page, but it has all the character songs on it. It therefore ranks very highly in my opinion, since no one else's got 'em all

This site has tones of MP3s. most of them BGMs, other multimedia, character and mecha info.

A Tear Drop in the Ocean
This is Msmelanie, the author of The Trouble with the Truth's site, check it out for her fics, as well as a quiz and some other info! Neat colour scheme!

A small (but hopefully growing) Gundam Wing site.

Another small but growing Gundam site, this one is not devoted exclusively to Gundam Wing, but touches on all the Gundam series. A fairly large image gallery, too!

If you would like to submit a link, all you have to do is email it to me and I'll put it up. It would by nice if you linked to me, but it's not nessesary or anything.