examples of filtering data based on a series of and/or/not criteria?

If anyone could share good/interesting examples of allowing users to set a
series of boolean logic rules to filter data, I'd be interested in hearing
about them.

I need to assist in the design of something that allows users to filter data
based on about 7-10 of these rules and am concerned that a series of
drop-down menus that long will be cumbersome.

thanks,

--David VanEsselstyn
--Wireless Generation
--Senior Usability Analyst