James Gosling, widely credited as the creator of Java, will be at a special session of the San Diego Java Users' Group on August 8th. Love it or loathe it, Java has changed the direction of software development, and Gosling has been a major force behind it.
Based on the record turnout for last month's presentation by Google on the Google Web Toolkit (GWT), seating will be scarce. You'll also need to RSVP beforehand.
Drop me a line if you're interested in meeting there.