The Sigma flash should work with P-TTL, but you may need to send it in to Sigma for a firmware upgrade. For wireless, I think you'll need another flash as the controller -- the K10D can use the built in flash as a controller but I'm not sure if any of the *ist models can. (Not sure on that, though.) It doesn't work with the K100D or K200D.
Also look at the Metz 48 AF-1 -- considerably cheaper than the Metz 58 AF-1. I have one and it works great with P-TTL, both on-camera and controlled as a wireless slave.
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