I've had an exception in iso8601.py line 22, 'unknown or illegal ISO-8601 date format: '2009-06-04T08:00:00'. Hope that can be cleared up as it's my better halfs calender that won't sync :-) I'm no Python expert, but the regular expression there looks OK to me...
Maybe an option for 'don't sync back more than N weeks' would be useful - I've certainly no need to see things that long ago !