This is normal. It's a hot/stuck pixel on your sensor. It might disappear or reappear depending on ambient temperature. And yeah, might be joined by "friends".
Some RAW conversion software can automatically map these out if you provide a (n otherwise) black frame for reference. Alternately, Pentax tells me they'll map out any stuck pixels at the firmware level under warranty (if you don't mind waiting a month or more without a camera).
I just compared Pentax to Olympus in my last post and I'll do it again -- Olympus cameras (even some of the P&S models!) have an in-camera menu option to do this. I really wish Pentax would follow suit.
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