ProjectLocker recently introduced WebHooks for our Git hosting and Subversion hosting services, which allow you to configure ProjectLocker to notify one of your servers anytime a push (Git) or commit (Subversion) happens. The notification isn't just a 'ping', but provides all the relevant information about the event -- files changed, author, timestamp, etc. (The full JSON format is described in detail in the ProjectLocker FAQ.) That means you can use WebHooks for whatever you want -- integrating with your continuous integration server, sending out custom notifications, or anything else that could benefit from real-time updates from your repository.
WebHooks are available immediately for all paid ProjectLocker accounts.