The site is probably done in Flex. Checkout the cool glossy UI, and sleek Web 2.0 design.
They have got a huge list of Web 2.0 applications, and you can subscribe to their RSS to keep an eye on the new listings.
More Web 2.0 Directory / News / Blog links:
webscriptlab.com (by nicolas)
Please share if you have any good links to Web 2.0 Directories.