Is it possible to have Leopard and Snow Leopard at the same time?

If you have an Imac with an external USB HD, can you have Leopard on the HD of the iMac and install a fresh copy of SL on the HD? Would it work?

Thanks for asking, you reminded me of two things to keep in mind. Let's say you have two drives, let's call them SL and Leo. If you boot with SL all your preferences and settings are on the SL drive and if you boot with Leo, they are on your Leo drive. There's no crossover and nothing dangerous to worry about.
There are, however, two little things to think about. a) by default, when you boot with Leo your files will save to your Leo account folder and when you boot with SL they'll default to your SL account folder. This can get confusing. There are several solutions but the easy one, and the one I used, is to use DefaultFolder and set default save folders so that the file selector automatically chose my SL folder to save into.
The other issue involves Spotlight. When you switch from one OS to the other, Spotlight will try to reindex both drives. This isn't dangerous but it does bog down a slower computer. My solution was to use the Spotlight preference in Leopard and turn indexing off completely by making both drives private.

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