I was tech browsing around this morning and found this little gem. It says it can be used with the iPad as well as about anything else out there... not a standard mouse, but a lot of useful in this little package - Kind of pricey for now, but this could be the one that makes the iPad into a Laptop for a lot of folks. (I know... not the power users and special situations, but for the consumers and basic users)
https://www.kickstarter.com/projects/granto/propoint
https://www.kickstarter.com/projects/granto/propoint