iCal version 4 has a selection for Yahoo Calendar, but I keep getting server timeout errors. Based on this old set of instructions: I have followed Yahoo's instructions for syncing iCal I have tried various modifications of these settings without success. See attached screen shot for the required fields; iCal pre-fills both of these when you select 'Yahoo' as the calendar type. I have contacted Yahoo's technical support, but they are a bunch of idiots and have been no help at all. Thanks!