Hi Karen,
We are also looking to get married in Mallorca in August 2011. There are so many options you can choose from and will all depend on what you are looking for but so far we have been in touch with:
Finca San Bosch
Hospes Maricel (expensive)
Hotel Can Simoneta (expensive)
Son Marriog (have to do everything else yourself - catering etc)
Puro Beach Hotel
Other options are:
Villa hire
Would suggest visiting to all the wedding planner websites and then having a look at all their venues, then googling description and information they have provided and you can normally find the places!
We are also going over in October to have a look around - I have a wedding planner organizing all the small bits and pieces for me (transport, information packs for guests staying the week, liasing/negotiating with the hotel, ordering flowers, hair/make up, bands and entertainment). She is pretty good and has thought about loads of things that I hadn't even considered.
Good luck!