I have installed and tryied ZooZ in my Windows XP Pro successfully! It is great, and as simple as using M$ Visual things :)!
This is a great achievement to perl and Tk... Though it needs more time to standarize well.
Both tools that I have tried have very creative ways of approaching the GUI dessign. ZooZ looks more interested in getting the result. But both are very encouraging for using Tk in the daily script development.
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Also worth mentioning, SpecTCL works with a more general Tk version, though it's far from being as easy to use as ZooZ. However, it produces also Ruby, Python and Java code. http://spectcl.sourceforge.net/
Zooz is really great.
However if we modify *.pl file separatly (say I change height of button), then we can Not get reflection of modified code in Zooz interface. This is because Zooz works on *.zooz file and Not *.pl file(Please correct me if I am wrong).
But it is a good tool to develope complex Tk applications.