How do I bulk delete ShrePoint groups

I have around 750 SP sites set up.  Each site was set up with unique permissions.  SP 2007 helpfully created 3 SharePoint groups (' site members', 'site visitors', and 'site owners') for each site.  I don't use the SP groups as have created my own automatically populated active directory groups.  I have created some SP groups to use as audiences for web parts.  Every time I want to edit the membership of these groups, I have to wade through the 750*3 SP groups I don't use.  Now I'm trying to delete all of the extraneous SP groups.  Surely there's a quicker way than having to go through each one and delete individually?
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PowerShell is likely the best method - see for some helpful tips, although sp-deletegroup isn't in there.  I suspect there's a cmdlet in there somewhere
open them in exploer view and delete in bulk..
This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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