Those of you using Google's SSL-encrypted search will need to change your bookmarks. It seems that many users have been using the encrypted search to get around content blocking filters in schools. However, when schools block the encrypted search, they also block a number of other Google services, since they have the same domain. As such, Google has changed the URL for encrypted searches to https://encrypted.google.com to make it more content-blocker friendly.
If you type in the old address, you'll be redirected to the regular Google page and your searches will not be encrypted, so be sure to update your bookmarks and custom search engines if you want to keep your activity secure. Google says it is looking for a long-term solution to change the URL back to https://google.com, though for now, the new URL is the only way to access it.