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If you want to do this on an ad-hoc, ongoing basis.. it might not be as controllable as you hope. That is, there is no feature to specifically remove certain posts from digests (although we are hoping to implement that later). One thing you can do, however, is apply "search queries" to your digests. This lets you either show posts that only meet certain criteria, or exclude any posts that meet certain criteria.

For example, let's say your competitors are called "Microsoft", "Apple", and "IBM".. you could ensure no posts mentioning them show up with a query of "-microsoft -apple -ibm" on your digest. This can be applied on the digest editing screen.
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