UPDATE: RetinaPad has been updated (v1.3.4) and is now iPad3 compatible.
If you manage to get RetinaPad installed on your iPad3, it will muck it up and you will have to do a restore to get your freshly jail broken iPad3 working all better. Uninstalling RetinaPad will not help...
Trust me on this and take my word on it. Don't do it!
Oh, and please, don't ask me how I know.
P.S. Ah, the things I do for the team!