I thought it might be useful to have a place that listed all the projects that are running 64bit applications so that members can see where they will get an actual benefit.
As far as I know (not running any 64bit hosts!) the list is:
- 3x+1
 - ABC@home
 - Cosmology (Linux only)
 - MilkyWay@home
 - pPotTables
 
- RieselSieve
 - SETI@home Enhanced (Linux only)
 - WEP-M+2 (Linux only)
 
If you know of any others then reply to this thread and I'll update the list.
Cheers, MacDitch