I have yet to jump ship to the cross camera lens mix-matching, but Novoflex has given one reason to, they just launch a new adapter for Nikon lenses to Canon EOS bodies that is able to maintain electronic metering function, the catch? It costs $300:
The new adapter is made to very precise and high standards to ensure exact infinity focus on the Canon camera. With the EOS/NIK-NT adapter automatic exposure metering via stop-down metering is possible as is aperture priority auto exposure. The new adapter features a lever on the side of the adapter to let users control the aperture on G series lenses. For users of non-G series Nikon lenses Novoflex also offers their original Nikon to Canon adapter, the EOS/NIK.
Keep in mind, though, using a lens adapter means loosing light, and it requires some additional investments, like your time (practice) and accessories like a split-image focusing screen for the auto focusing function that you loose.