Just tried the latest snapshot on my Performa-550 that uses Cuda.  It 
appears that some recent changes have broken the ADB support on this 
system.  I noticed that there is a report of a non-working ADB on the 
macppc port with 1.5.1 as well.  Are the two related?

Since there isn's a recent 1.5.1 kernel for mac68k posted yet I can't 
test, but if someone has one I'd be happy to give it a try.  It would be 
a shame to see 1.5.1 released with a non-functional ADB for some systems.

-bob