Springround is available through Cydia for $0.99 and provides a method to access your Springboard from any iPad (or iPhone) app. Using an Activator action, you can enable the superimposed springboard to make an "ultimate app switcher" for your iPad. This tweak is functional with the iPad in portrait mode, but does have some bugs in displaying your springboard in landscape mode.
Again, Springround is available for your iPad and iPhone for $0.99 from Cydia. If you have already installed this tweak on your iPhone, you can upgrade your iPad through your account for no additional cost. I have notified the developers of the bugs in Springround for the iPad.