you could do this using python, it would be similar to what Nime5ter did with the gmail notifier.
Or you could use scrape with a timer. Should not be too hard, except that this would block the UI thread whenever waiting for the scrape which is not ideal.
I personally would use IFTTT for something like this. IFTTT watches RSS feed, sends alerts to Dropbox which VC picks up via the Watcher plugin. Should work well and you will usually get alerted within about 1 to 15 minutes I think.
