I like the browser in pharo-dev here - not spawning new windows but spawning
new panes inside the same window and using the scrollbar to return back to 
any point in browsing history. 

Or the sender/implementor/messages browser in Smalltalk/MT (see [1] for a screenshot)

Bye
Torsten

[1] http://lists.gforge.inria.fr/pipermail/pharo-project/2009-November/015521.html
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