Of the CS suite, I've found that Illustrator is the only one that really causes problems. I find that I get tons of errors and various other stupidity.
Let's hope they get the universal versions out soon.
That said, I've ALWAYS found Illustrator flakey and crash prone (PPC/x86 and Win32...all bad).
Agreed Illustrator has always been flaky and running it under Rosetta on an Intel Mac makes it even more unstable I've found.
Unfortunately there doesn't seem to be much else to do about it until Adobe releases CS3 next year sometime, which will be Intel Mac compatible. Then you get the pleasure of coughing up some more mega bucks for what should have been a free patch.