Ableton Live / MIDI Mapping / Arduino / Windows 7

Does anybody have any pointers to info on interfacing with Ableton Live using MIDI mapping across the serial/usb link on Windows 7. I've seen some demos using MapleVMC to create the virtual midi cables and then MIDI relay to map them across on xp - but I have no real knowledge on how they fit together - it's the practical bits I'm missing :( Any pointers / guidance / explanations....

A little bit of progress on this... I've used MIDI relay http://bit.ly/dp1qeu which works fine on Windows 7, installed LoopBe1 http://nerds.de/en/loopbe1.html for the virtual MIDI cable and can now send MIDI note-on messages from arduino using Serial.print and they are visible on the MIDI relay panel. My assumption is that these are being passed on to the loopbe1 midi port as that's what's visible under control panel / devices...

I now need to look at mapping Ableton Live....