Well, YHOO's total market cap is now about $37.36B, so it's not a complete travesty. (MSFT would have gotten the Alibaba investment with the $45B offer)
I still have trouble wrapping my head around why Microsoft even made the offer, but I have even more trouble understanding why Yahoo rejected it.
Yahoo: MS offered us way more than we can figure out we're worth. They must know something we don't. Reject the offer and we'll monetize it ourselves!