Here's some info - no personal experience though.
http://www.rentwindsorhillsvillas.com/map.htm
Maingate Transportation provides daily shuttle service serving Windsor Hills Resort with 2 morning pick-ups and 2 evening return runs that are at scheduled times. These runs are shared with other guests from the resort. Pricing per round trip for this service is as follows (2011 prices):
All Disney Parks: $11 per person
Universal Studios / Islands of Adventure / Wet 'n' Wild: $15 per person
Sea World / Discovery Cove / Aquatica: $12 person
Orlando Premium Outlets: $11 per person
All rates are based on a per person round trip. Departures and returns are set to meet the theme parks operating hours. Shuttle vans are available for large group transfers and/or charters.
If you have 6 or more people, it makes sense to hire a private van since it's charged by the trip and NOT per person. This can be arranged any time of day for morning pick-up and evening return as you don't share this service with other guests. The van holds up to 14 people and the round trip costs are as follows:
Disney Parks: Around $60 per van
Universal Studios: $85 per van
(and there's more info at the link I posted - phone # and stuff).