From what's being said on his blog:
I've been working on a new and improved version of TinyUmbrella that will, among other things, allow you to restore your iDevice without iTunes. With the holiday season and work, this will take me a bit to get working the way I want it. I appreciate your patience and your support. You guys are awesome :) No ETAs yet but I'll post updates here and on twitter.With this feature in TinyUmbrella, you won't need iTunes anymore and of course, this will bypass all errors while downgrading, updating, and may help with preserving the baseband. We'll post updates as they come, stay tuned !