I know of a few people who use both Canon and Nikon dSLRs.
I'm curious about how many people actually own and use 2 (or more) different systems of dSLRs.
As Canon and Nikon are the more dominant brands and there are too many possibilities of combinations, the others will just be called other in the poll but do state what is the other in your posting.
Pls note, don't include your PnS, Rangefinder, Lomos, etc. This is only about SLRs!