A search for “memory leak” on the forums only showed a recent thread for EagleFiler.
However, I’m also experiencing a severe memory leak with SpamSieve when using Apple Mail. After about a day, the real memory is close to 1 GB and the VM is close to 2 GB. If I disable the rule that invokes SpamSieve, then I no longer get the leak.
I have 2 GB of physical RAM in my dual 2.3 GHz, G5. As a result, when the leak is large, everything slows down and hammers the disk with paging when switching between programs. I quit Mail and SpamSieve, relaunch, and everything is fine for awhile.