I just installed logmein as suggested in this thread
http://forum.ppcgeeks.com/showthread.php?t=27301
It looks like you can put the pc in sleep mode, and later log in using your Phone. Install logmein on the home PC. Then log into logmein.com with IE on your phone. It will have you download a remote access .cab. Then you can log in and control the home PC. So far it seems to work great.
Also the standard version of logmein is free!