One of the original ASP sites, there is a great deal of content here, plus links to a wide variety of resources. Lots of information, very usefully categorized. Some articles and links from Microsoft. Includes free sample code and several demos. Lots of information.
Some material requires registration, and some requires paid subscription.
ASPZone is a smallish site that has a few articles and a discussion forum. Companion site to the Active Server Pages Unleashed book. Wrox Press' entry in the ASP Site race, this site features daily articles including a searchable archive. 15Seconds has a huge number of links and resources. They also run the most active ASP Listserver.