Hi,

I'm not the biggest fan of Glade either, even though it's been already some time ago since I used it last time. If you are searching for an easy to use UI creating tool, I would suggest to have a look at Qt and Qt Creator. Even though you need a lot of libraries it is worth to have a look at it in my opinion. There are as well Python bindings for it, if you consider using python.

Cheers Daniel