I just checked it; it works for me. Define "not working"--is it not downloading for you?
Edit: Are you using the up-to-date URL? BKU just posted a new link (and the website reflected it when I tested):
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For those following the SVN: Garry has messed with the directory structure a bit. It's important to note that the SVN URL now looks like this:
http://facepunch.svn.beanstalkapp.com/gmodgame/garrysmod/gamemodes/terrortown/
So where it said "trunk" before, it now says "garrysmod". This will confuse your SVN client. Depending on how you use the SVN you may have to modify some things or do a new checkout.