It's October 31st, which can only mean that while the kids go door to door to get candy, we're going from Web site to Web site to find out which Web companies are embracing Halloween in the true tradition of logo modification!
Google, which has a very long history of this thing, is of course participating. So is Google's subsidiary, YouTube, and Google competitors, Yahoo! and Technorati. Even Friendfeed, started by some ex-Googlers, has debuted a great Halloween logo.
Can you find any notable Halloween themed logos out there that I missed, and hopefully some that have absolutely zero to do with Google? Post them in the comments, and we can update the picture.