God of War Collection, EU version works fine on my JB'ed USA PS3.
I run it from the internal HDD though, and I think you need a disc in the drive otherwise it won't boot. Can't remember which version I'm using, but it's Open Manager... and I know it's one of the older versions (really need to update it!)
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)