TinyUmbrella version 5.01.00 has been released and was announced by @Notcom on its official Web Site. With this version you can save 5.0.1 SHS of iPhone 4s, but unfortunately not be able to restore iPhone 45 iOS 5.x as Apple has altered the way its signs firmware. But other devices running on iOS 5.0.1 can restore or downgrade to the older firmware. And TinyUmbrella 5.01.00 supports Mac and Windows OS.
Anyway you can expect the next release will be a working solution for restoring iPhone 4s running on 5.x, I hope so too.