I recently installed biab 2009 on my fedora 9 machine. Mostly it works well, especially with the audigy ;-) There were a couple of dlls that needed to be copied in order to get it going.
Biab will not however generate any real tracks - it fails with a window that is impossible to dismiss displaying 0%. The command prompt displays:
fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_PERFORMANCE_INFORMATION
over and over. It appears to be an unimplemented function call.
The program seems also to not deal with the realtracks wma files, but even sidestepping this step by making them into wav format (using mplayer) did not allow realtracks to be generated.
Pretty much everything else worked.
Things for Linux are definitely improving - all the latest high end creative X-Fi cards now have open source drivers ;-)
+1 I encourage pgmusic to consider a native linux version