We really can't extract or create an accurate picture of a weblogger -- what he or she stands for or believes, what kind of voice we can expect as a visitor to this blogger's site -- without factoring in that blogger's unique voice and its evolution over time.
I think expectations today are that each post stands alone.
I think that can't be true.
Melanie has wrestled with this question and in response has developed her own Contextual Introduction to give readers who find her through one of many avenues a better up-front flavor of who she is, and who she isn't.
I like it, as much as an exercise I should put myself through for my own thinking and assessment as a tool for readers to understand what to expect here. I might also link to some of the posts I've written that I feel tell the most about who I am in the context of this blog.
Interesting idea and well done. Now, I wish someone would do it for me, because while I'm full of ideas these days, I'm a bit short on execution........