Well, I answered the first question if you meant "Is there any other way I can write a GUI using PHP?"
I assumed that since this is a PHP forum and that you mentioned PHP in the title of the thread, that you wanted to use PHP...
There's a couple of good articles here
And as the last stable release was 15th July 2005, I would say that it is still active (although I haven't had a look at the CVS repository) just not as active as, say, firefox.