A few months ago I threw together a simple plugin to carry out some subversion tasks from within Sublime. I was meaning to mention it here in case it was of use to anyone else, but it seems that I forgot!
The aim is to provide a quick method to commit simple changes without leaving Sublime. To this end the only subversion commands that are supported are 'status', to check what will be commited, 'add', to add new files to the commit, and 'commit'. Committing will show you a diff of your changes, and allow you to enter a single line of text for the commit message.
You can find the plugin and instructions for use at the following page.