Sorry your 70-200mm got stolen
Pretty much all that is "available" in Pentax mount are second hand Sigma 70-200mm f/2.8s and (less frequently) Tokina 80-200mm f/2.8s and (even less frequently) Pentax FA 80-200mm f/2.8. Sigma is SUPPOSED to be releasing the latest version (DG EX Macro) soon, and Tamron has a 70-200mm f/2.8 in the works (I heard first quarter 2008)...
I LOVE my K10D and having a stabilized 50mm f/1.4, 35mm f/2.0 AND my f/2.8 28-75mm (Tamron) are awesome! But my longest fast focal length is 105mm from my Sigma 105mm EX DG Macro (not counting my cheapo manual Sears 135mm f/2.8) and I REALLY want a fast 70/80-200mm... Only thing missing from Pentax that makes me even consider switching brands....Come on Sigma and Tamron!!!!!