This is the second time in less than a month that this question has occurred to me, so I figured it was time to document it for myself...
Once again, Google provided lots of references. Among the ones I found more understandable were the Rutgers Guide to Grammar and Style, Malcolm Gibson, a former newspaper editor professing journalism at the William Allen White School of Journalism and Mass Communications at the University of Kansas in Lawrence's That & Which, That, which and who at BettaKnow, and The Electric Editors' ‘That’ or ‘Which’? Relative clauses.
Now that you've looked over a few references, see how well you really understand when to use which (sorry, I couldn't resist) by taking this quiz.
As an interesting (at least to me) aside, searching for "that or which" in Google produced very different results than searching for "which or that," both of which produced results as opposed to searching for that or which (without the quotes) which produced a non-result of:
The following words are very common and were not included in your search: that which.
The word "or" was ignored in your query -- for search results including one term or another, use capitalized "OR" between words.
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Posted by David at January 25, 2004 10:55 PM