DVDBurning - 3:46 am on May 23, 2003 (gmt 0)

My best estimate is about 12 words.... but it may actually have more to do with the number of characters before additional words are ignored.

Google doesn't publish this information... you will have to reverse engineer it by looking for high PageRank pages with long titles, then searching for words or phrases found near the end of the title to see if the page appears in the results. This method isn't perfect (as the results also depend on other on-page factors)... but let us know what you find.

Long titles probably dilute the value of any given word or phrase... so it isn't necessarily smart to optimize for too many words anyhow.