Thanks to everyone who shared their knowledge about
programs that can convert a graphical representation
of a phylogenetic tree into a text format (e.g.,
newick).  It seems as though there is a lot of
interest in such software but really only two
programs that can get the job done.  They are:

TreeSnatcher by Laubach and von Haeseler:
http://www.cibiv.at/software/treesnatcher/

TreeThief by Andrew Rambaut:
http://microbe.bio.indiana.edu:7131/soft/iubionew/molbio/evolution/phylo/TreeThief/main.html

Below is the original question:

  Dear EvolDir members,
  I am curious if anyone has developed software or
  knows of any that exists that can convert a
  graphical representation of a phylogenetic tree
  (e.g., .pdf/.ai/.ps file created from a phylogeny
  in a published manuscript) to a text format (e.g.,
  newick or phylip).  I know there are lots of
  programs to go the other way (e.g., from newick
  format to a graphical representation), which is
  why I am thinking that it might be possible to
  convert a tree back to a text format. 

  From discussions with those in my local academic
  community, there is interest in whether such a
  conversion is possible.  I will also compile and
  post any comments I receive. 

  Any information or suggestions would be greatly
  appreciated and thanks for your time,
  James

jpetteng@umd.edu