Card/Gift/Shopping Spam (or: More Spam Reduction Techniques)

[Neil]

I'm seeing a lot of shopping, gifts, prizes, and cards (ie. credit  
card, gift card) related spam in the last week or so.  (Maybe due to  
Black Friday?)

I'm using Sought, Bayes, and default rules.  Is there anything I can  
do to reduce the amount of spam getting through?  I've already knocked  
the threshold down a little.

If it helps, here are some examples:
http://dpaste.com/94956/
http://dpaste.com/94957/
http://dpaste.com/94958/

Thanks,
Neil.