Blink 182's Official Web Site - Is a very impressive Flash web site that has lots of information on Blink 182, this web site is one of the closest contacts of the band on the net.
This site has loads of information on the band Blink 182 such as how the 182 was formed, the albums released by the band, new music and history.
Greg's Blink 182 page which has all the lastest information on Blink 182 like their old music, the members of the band and also has a great links section.
This site has ALL the lyrics of Blink 182's songs.
This isn't a Blink 182 site in itself but they have an awesome range of Blink 182 posters that you CAN use on your own web sites, you can also purchase most of the full size Blink 182 posters.
A great selection of official Blink 182 merchandise can be found at Blink182Worlds.com.