Huh interesting (and my first hunch was KPCB as well), since he works with KPCB in his subsequent ventures, including Netscape (I seem to recall that his beef was with one particular partner rather than the firm as a whole, so maybe that is why).
The valley grudges by top executives has always been amusing and entertaining to me -- for example, Ben Horowitz's refusal to work with E&Y after they nearly blocked their acquisition by HP.
