I once wrote a program that would create a report for a SONAR project, including plugin usage, but it was so horribly slow that I abandoned it. Unfortunately, the file format is not publicly documented (understandable, since they reserve the right to change it at any time) and that makes it difficult to extract information from it. If CW ever decides to make the cwp format public, I'll revisit that endeavor.
For simply listing your plugin inventory,
VSTInventory will put all your plugins into an Excel spreadsheet, or, if you don't have Excel installed, into a delimited text file.