Every size up to 2^26 is possible for the official server.
Also, the gzipped map can be up to 1MB, I think.
I thought of a nice way to use a huuuuueg map with a custom server: send a blank (0x00 padded) gzipped map to the clients, then have a metric crapload of lag sending all the single block edits.
Someone should try this :tongue.gif:
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<Quatroking> Minecraft is a dozen of puppies and kittens smashed into cubes, then mixed up with a few ounces of pure liquid rainbow and after that it spends two hours in the oven. Ready to be played by another drooling ten-year old