GoogleAlert is a free web service that notifies of new hits from Google on saved search queries. It has just enhanced its service to learn from the results you choose to view and can apply case-sensitive and punctuation-sensitive rules to a set of Google search results.
From the announcement:
"The new SightPoint personalization technology automatically rates new
search results based on their similarity to results the user has clicked
on before. SightPoint uses Bayesian statistics, made popular by spam
email filters, to identify useful information in a sea of background
noise. The feature is now available on an opt-in basis to all users of
the free Google Alert service.
Google Alert also announced today the release of case-sensitive and
punctuation-sensitive search technologies. These features help users
filter out unwanted noise by automatically removing any results that
don't match the exact case or punctuation of a search term. Google Alert
already provides users with full access to Google's advanced search
features, including targeting by language, file format, country and
domain."