[DetroitT]

I found my system to be more stable overall in 64knl.
I work post composition and sound design (Stereo and SMPTE surround)
64 bit kernel MacPro 12 core 12GB ram OS 10.7.2
Magma with HD3 Accel (Core Rev. J, Accel's Rev F, All firmware Rom's: A)

3-Displays via ATI Radeon HD 5870 (19" - 27" - 19")
External OWC Raid 5 for Video, Separate SATA drives for SFX, Smple libs, Audio sessions, Boot.

Primary apps;
PT's HD 9.0.6, Melodyne studio/single (standalone), Reason 6 (32bit)
Notion 3 & Finale 12

I also found this true for 2008 MBP OS 10.7.2 PT's 10 regular with FW-800 OWC audio drive.

All back-up/archives via Drag n drop or Superduper.
Disk catalog maker database.