I have developed some code and a workflow for converting Commonspot 4.5 web sites into Drupal 6.x  web sites. These pages cover aspects of the process.

Here is some Drupal training information. 

Here are some sites that are being converted:

Commonspot	Drupal
http://lts.library.cornell.edu	http://test.lts.library.cornell.edu
http://astech.library.cornell.edu/ast/phys/index.cfm	http://test.psl.library.cornell.edu
http://astech.library.cornell.edu/ast/math/index.cfm	http://test.mathematics.library.cornell.edu
http://astech.library.cornell.edu/ast/engr/index.cfm\\	http://test.engineering.library.cornell.edu