To remove repetitive errors on the MOSS 2007, set a valid domain account for the web applications.
here is someone who had similar issue in the past: http://vspug.com/rlangley/2007/10/10/failure-trying-to-sync/
In meantime trying out this free and gret app: http://spi.codeplex.com/
It helps to decypher GUIS in the event viewer. I could see that these errors are coming MySite and SSP sites.