Nicholas, It should be possible to install on a Mac. First you need to install Python (http://www.cwi.nl/~jack/macpython.html), and make sure to also install PIL as part of that (it's an optional part of the installation).
Then install the Python files in a folder somewhere. Invoke parser/python/PyPlucker/Spider.py as a Python script, and you should be in business. The piece we're missing is a nice packaged-up Mac installation, but the existing parser should run OK. Bill
