Cluster analysis software sought

[stolcke@ICSI.Berkeley.EDU]

I am looking for a tool that does hierarchical cluster analyis *and*
is able to display the resulting tree in some high-quality graphics
format (such as Postscript).  The program I am currently using prints
only a crude approximation using ASCII characters.

It would truely appreciate it if anybody who knows where to find such beast 
could drop me a note.  

--Andreas Stolcke