Want to connect your iPad to a mouse? Here is a great tutorial that will help you get going.
Step 1 : You need to jailbreak your iPad to proceed. Please be forewarned that jailbreaking your iPad may void your warranty and cause instability issues. You can use Spirit Jailbreak solution to jailbreak your iPad [Mac | Windows]
Step 2 : Tap on the Cydia icon on your iPad HomeScreen and visit the Big Boss repository. Download the BTstack Mouse application from here
Step 3 : Once done, launch the BTstack app and let it discover your Magic Mouse (or any bluetooth-capable mouse)
Step 4 : Once you have set the connection up, it should work without any issue
Here is a short video demonstration[via RedmondPie]