This posting is older than 6 months and can contain outdated information.
Yes. It took some time, but finally I was able to reproduce it by 
letting the G5 go to sleep and wake over and over again.
As the panic log already suggests, the panic is actually happening in 
Apple's IOUSBFamily. So I dived into Apple's sourcecode, isolated the 
problem and by now have completed a workaround.
Result: 
- Remote Buddy's kernel extension is not to blame and thus also 
doesn't need an update. 
- The problem is caused by how the USB APIs are used from user-space. 
- The problem only does/did affect users of the Keyspan RF Remote for 
Front Row.
I plan to release the workaround - along with a fix for the "some apps 
keep relaunching" issue (which needs some more debugging and code 
reviewing as I can't reproduce it with 1.7.3 anymore) - later today.
Best regards, 
Felix