I've lost track of the thread where we were discussing making silicone chocolate molds so I'll post my results here until I can find it again.
I ran down to Toronto and purchased some Smooth-On brand Smooth-sil 940 which is a food grade silicone for molding.
I took the little plaster groundhog (he used to be a beaver, but his owner lives in Wiarton and wants a Wiarton Willie chocolate mold, so he dremelled off his tail...voila...groundhog), attached him with a bit of sticktack to the bottom of a plastic container that had at least 1/2 an inch clearance all around. I mixed the silicone with the catalyst, then poured it in around him. I let it sit overnight and cut the container off in the morning. I then cut him out, placed the mold in the oven at 175 F for 4 hours and this evening I tried molding him for the first time. I painted the mold with milk chocolate, put the two sides together, poured in the milk chocolate, bound the whole thing up in guaze cling wrap (didn't have any rubber bands), banged it gently to get out the bubbles and put it in the fridge for 30 min or so. He unmolded very nicely.

Original plaster groundhog (beaver)

Silicone mold produced

Chocolate version
I think this is a nice workable solution to those one off molding jobs where you have an object that you want to copy in chocolate. My sister in law has a whole bunch of Royal Doulton figurines, think she'd let me play with them?