Yesterday, Yahoo's stock hit a new 52-week low, touching $13.79 before closing at $13.84. Things are looking rather brighter this morning, though, as the stock is up to $14.09 following a declaration that Yahoo may buy back $3 billion in common stock. This announcement, which came via an SEC filing , provides an interesting window into the thought process at Yahoo. Obviously, $3 billion is quite a lot of money, and could be used to hire all sorts of engineers,