TubeFixer is now a MobileSubstrate tweak!
Added HTTPS support for iOS 5.0+
Added iOS 4.3+ YouTube App Store support
Added iOS 6.x YouTube app support (removes update nag)
Removed HTTPS on iOS 3.0-4.3.5
Prevents installation on iOS 2.2.1 and lower
A bunch of server-side improvements (TubeFixer API v2)
Video playback/URL grabbing is now much more reliable
Added "More by user"
Added related videos
Added channel search
Improved "most recent" and "most viewed""
Probably much more, that I ended up forgetting.
Patched authentication/sign-in process
Added iOS 6.x support