I don’t know when the GMail team slipped this feature, but GMail has an RSS feed for what looks to be the unopened mail items in your inbox. Of course it is an authenticated feed (you don’t want everyone to read about your penis enlargement order), so make sure your News Aggregator supports it.

I stumbled upon this because Firefox put up the “RSS enabled” icon in the lower right hand corner of the status bar, but it looks like GMail even has a help topic for it.