iOS 8.1.1 was released earlier this week, and it includes a few small bug fixes. It also happens to break the current version of the iOS jailbreak. If you updated on accident and want to keep your ability to jailbreak, iDownloadBlog shows you how.
For the time being, Apple is still signing the iOS 8.1 firmware, which means you can still download and install it manually. This window won't be open long though, so if you're interested in jailbreaking, now's the time to downgrade. You'll find the full guide for doing so over on iDownloadBlog.
How to downgrade to iOS 8.1 [iDownloadBlog]