I submitted a bug via Apple's bug tracker 4 months ago. The bug is a data corruption issue in the kernel/libc and it is very easy to reproduce. I also suspect it is easy to fix, since it is a case of saving/restoring some registers in signal handlers. Apple has not fixed it, or even acknowledged that it exists. I'm willing to bet $100 that nobody at Apple has even read the bug report. It is very likely the entire public bug reporter is just for show, sort of like Sun's "bug parade".
As for the infamous gcc x86 backend bug, well the one I submitted was closed as a duplicate... of a bug which has been open since 2003.
Update: my friend at Apple tells me my bug was fixed in June, but I'd have to be a Premium or Select ADC member to see this, since apparently even bug fix notifications are covered by the Leopard beta NDA cloud.