I just saw a really cool WPF twitter client that I think is developed by the Herding Code podcast guys HerdingCode called Witty. (or at least, I see a lot of those guys usi
See my answer to a very similar question here: How to download/checkout a project from Google Code in Windows?
In brief: If you don't want to install anything but do want to download an SVN or GIT repository, then you can use this: http://downloadsvn.codeplex.com