If you were wondering why the yahoo logo looks different as of late it is because their logo is changing on the daily. Why? Well, as a clever little marketing campaign to reveal their new logo. The 30 days of change will offer a different logo every day and the big reveal will come after they have run the full gamut of typefaces.
On the plus side, this is a great campaign to create interest. Then again, everyone is a critic and will cite reasons why one of the 30 day logos is much better than the final.