I know this is an old post, but a group of us are working on a SageBoxee app so you can use Boxee as a front end to Sage. We've got a POC working, but it's not real fancy right now.
Repo is here: http://sagetv-boxee.googlecode.com/svn/trunk/repo/
and then install "SageTV for Boxee".
This is VERY early stuff (so no need to post here about visual elements that are not right) but you should be able to browse your TV recordings and play them. If you can't, please let me know.
You must first install the sagex-services on your Sage server.
The first time you launch the app it will prompt you for the Sage server name and port, jetty user name, and jetty password. I strongly suggest using the IP of your server and not the network name. You can change the settings from Setup->Boxee.
If your sage recordings do not use UNC paths you will need to enter mapping information. To do that go to Settings->Boxee. The format is
If your recordings do not play try replacing hostname with the actual IP address.
The only menu that does anything (besides Settings->Boxee) is "TV". It will bring up a malore style browser with the show names in the left pane and the episodes in the right. You'll notice that when you navigate in the left pane the right pane does not change. To update the right pane press enter in the left pane. I'm trying to figure out how to update the right pane automatically but so far I have been unsuccessful.
Like I said, this is a very early POC.