Although some people either do not have an SVN client or simply prefer to download flat files*, others would like to be able to quickly and easily update to the latest version the moment it is released. This is one use of SVN, more so in the Garry's Mod community. Here is the link you will need to input into your SVN client to check out the latest revision of MTW:
"http://minitankwars.googlecode.com/svn/trunk"
*These are actually just dumps of the SVN that I've zipped up, so if you can, SVN is the way to go.
