UncleFungus has updated FAHmon with bonus support and lots of fixes/changes.
Obviously its not HFM.NET but its the old standard and its good to see it back
Also good to remember it is available for Windows, Linux and OSX
Download FahMon :: 2.3.99.3
ChangeLog:
v2.3.99.3 (19/10/10)
General
Monitoring
* Added fermi core support.
Windows
* Removed agressive exe stripping options when using MSVC 10.
* Fixed bug where old projects file wasn't deleted.
v2.3.99.2 (17/10/10)
General
Monitoring
* Added missing protomol core support.
* Added missing openmmgpu core support.
* Added bonus ppd (kfactor) support.
* Added missing smp2 core support.
Other
* Fixed a number of thread safety issues which caused intermittent crashes and generally undesirable behaviour.
* Added Simplified Chinese translation.
* Added Slovak translation.
* Projects database now stored in xml, and will migrate from old format automagically.
Linux
* Fixed accidental inclusion of a gcc debug warning level into compiliation. Removes the scary output from 2.3.99.1.
* Fixed RPM .spec file. Thanks to "error".
Windows
* Now built against wxWidgets 2.8.11
* Updated MSVC project to version 10.
Obviously its not HFM.NET but its the old standard and its good to see it back

Also good to remember it is available for Windows, Linux and OSX
Download FahMon :: 2.3.99.3
ChangeLog:
v2.3.99.3 (19/10/10)
General
Monitoring
* Added fermi core support.
Windows
* Removed agressive exe stripping options when using MSVC 10.
* Fixed bug where old projects file wasn't deleted.
v2.3.99.2 (17/10/10)
General
Monitoring
* Added missing protomol core support.
* Added missing openmmgpu core support.
* Added bonus ppd (kfactor) support.
* Added missing smp2 core support.
Other
* Fixed a number of thread safety issues which caused intermittent crashes and generally undesirable behaviour.
* Added Simplified Chinese translation.
* Added Slovak translation.
* Projects database now stored in xml, and will migrate from old format automagically.
Linux
* Fixed accidental inclusion of a gcc debug warning level into compiliation. Removes the scary output from 2.3.99.1.
* Fixed RPM .spec file. Thanks to "error".
Windows
* Now built against wxWidgets 2.8.11
* Updated MSVC project to version 10.