This article should answer most questions on iPad owners trends. I didn't post the actualy article because there's a large number of graphs and charts.
The State of iPad Satisfaction
We did a survey sometime back regarding what do you sync with and based on 200 responses it was 50 50 from this forum I am happy to set up another poll as we now have almost 10,000 members but frankly I think results will be similar in saying that I would not be surprised if apple was 60%