We keep toying with the idea (espcially after ruling out a DVC membership - the figures just didnt work for us) but I think we missed the boat for now. Prices are nearly double what they were 5 years ago and there are so, so many unrented properties, making a real go of it would be tough. With so much competition, your villa would need to be stunning - as prospective renters expect a lot these days (south facing pool, unoverlooked property, spa, games, internet access etc etc) and it all mounts up.
Our conclusion has been, it is something we WILL do, but only when we dont have to rely on a rental income to pay the mortgage. With the heavily oversubscribed rental market (and more and more villas being built every year) I wouldnt consider taking one on as a business in the current climate.
I think prices are going to drop soon - too many properties, not enough buyers - so if you ARE going to do it, I think it would be wise to leave it a bit longer.
Good luck with what you decide!
Allie