A few sections of the site have been updated recently. The Map Screenshots page now lists all of the official 3.0 maps. MrMagic's excellent guide to Setting up a Sven Co-op server has also been updated, be sure to check this out if you're thinking about starting your own server.
There are still a few sections of the site that are fairly out of date. This is due to all of the focus that was put on 3.0's release, we really didn't have much time to go through and update information. Hopefully we'll get the other pages of the site finished up in a few days. There should also be a few articles on the new sound replacement tech in 3.0 and some general odds and ends things.
3.1 is in the works now. It looks like there will be a few new features or maps with it, but for the most part it's just going to be for some important bug fixes. Hopefully we'll get that finished in the next few weeks or less.
Erik Johnson from Valve has been making some progress with getting Sven Co-op 3.0 onto Steam, hopefully that'll be up sometime soon. He's been really busy lately, so it's understandable that we're not on Steam just yet.
Lastly, if you have a Sven Co-op related website, be sure to drop me an e-mail and I'll add it to the links page.