Starting with the oldest:
July 7th, 2008: Aluminum case from Apple.pro
August 24th, 2008: ‘Upcoming ad’ showing all aluminum MacBook Pro and MacBook Air-ish design
September 17th, 2008: German T-Mobile image with slightly different design than current model
September 25th, 2008: Two-tone MacBook Pro with touchscreen touchpad showing the dock.
October 2nd, 2008: Two-tone MacBook Pro with advertisement- looks like a 17-inch model.
October 8th, 2008: Images showing what looks to be a single piece of something making up the bezel
October 9th, 2008: Three more images showing off a new bezel also from Apple.pro
October 9th, 2008: Apple invitation displays a 13.3-inch laptop
October 10th, 2008: Video from Apple.pro showing a small laptop, looks a lot like the August 24th advertisement