Can I mirror my iPad's display using the VGA adapter for use in a presentation? I would love to be able to mirror the display of my iPad on a projector for use in a presentation. Is there any software available to do this - on the AppStore or if necessary for use with a jailbroken iPad?
There's no official way to achieve this.

You have to jailbreak your iPad and use a software like DisplayOut (works on all iDevices) to do this.