I'd be interested to try this. My Pi generally stays in our house and is always connected to our home LAN (via Ethernet), and is already mounting four NFS shares from our Synology NAS box (no problems at all there), so I imagine swap over NFS is feasible.
Only thing I'm not sure about: would the access be fast enough? We're still using HomePlugs* at 200Mbps (hahahahahaha, oh stop it, you're killing me

), which in reality aren't massively faster than our equally glacial broadband. Would the access be anything like fast enough to make swap-over-NFS a less-than-painful experience?
* - Yes, yes, I
know HomePlugs are horrid and make radio amateurs' lives a misery. I'd thread Cat5e (Gigabit) cables throughout our house tomorrow if I could do it without breaking (a) the bank and (b) our paper-thin plasterboard walls, and (c) working out how to run the cable between the floors without it being visible... but that's a rant for another time/place
