Beanstalkapp is pretty decent and has a great interface, however you can't specify custom commit hooks. There are a number of predefined ones (such as message basecamp after each commit etc.), but apart from that there's not really a huge amount of flexibility. You're also limited on space and users, which could be a big draw if the project grows.

Assembla is ok, but personly I dislike it.

Springloops is a great svn host, they offer more space and more users than beanstalkapp, however I don't think anyonomous users can checkout the repo.

Github on the otherhand is absoloutely amazing. They use Git (duh :P) which is totally different from svn, but after a little while you get used to it, but in the mean time there are plenty of useful guides, screencasts and of course the official docs