It seems lately the Holy Grail of game GUIs has been Flash. Scaleform is an example of a commercial GUI based on Flash. This does not work for indies because of the cost.
Hikari is a great option for Ogre users. It was just released yesterday and I already have it integrated into Zero Gear. It is still new and needs a little work but thanks to it being open source (LGPL), we should start seeing a lot of support from the community.
P.S. One thing to mention is Hikari only works on Windows.
There is more discussion in this thread: http://myzerogear.com/phpBB3/viewtopic.php?f=8&t=22
I want to display real-time chaterater in invetory window.
How to render to texture in hikari flash gui?
This isn't really a support forum for Hikari. You should post questions like that here: http://navi.agelessanime.com/forum/viewforum.php?f=5&sid=305ed34c52883319f579cefdd3bb1beb
You will get a much better response.
[...] comes to long build times. I started getting MyGUI integrated into Zero Gear. While we already have Hikari for our GUIs, we need something a bit faster for the in-game [...]