I am using DL 3.5.1 and it seems that whenever it starts to sync, the sync wheel just keeps spinning until it DL is unresponsive. I have watched Activity Monitor as this happens, and the Real Memory used by DL keeps growing until it says it is not responding.

This has happened if I have added/edited a task, event or contact in DL. It has also happened if I add/edit an event in iCal. Basically, DL is unusable for me now as it freezes shortly after I do anything with a task, event or contact.

Whenever it crashes, the crash reporter comes up and I send in a report. I have done so about 5 times now.

Sorry, I don't have an answer for you, but you can choose to turn syncing off for now until you get a solution. At least you can keep working!

Syncing is extremely intense on my G4 powerbook. Do the intel machines work better?

I didn't have this issue the first couple of weeks that I used 3.5. Then, it started all of a sudden. Soon after, 3.5.1 was available and I downloaded it hoping that would fix it. But, no luck. I can't believe that I'm the only one with this issue.