Confirmed -- RDP will ONLY work as a HOST with W7 PRO / Ultimate (probably enterprise as well -- haven't tried that one).
For all those with W7 downloads from Technet / MSDN / "Party Packs" I wouldn't bother to even think of installinh Home Premium if you want to use RDP.
To me this seems a HUGE omission since I'd suspect over 90% of computers sold with W7 installed will have the Home Premium version.
More and more people want to access their HOME computer remotely .
With Home Premium you can of course CONNECT to work / other remote computers via RDP provided these are at least XP PRO / W7 Pro / Vista Ultimate.
A possible get around is to either set up your own VPN (a bit complicated) or set up an FTP / other web server at home.