For more, see Poynter Online's advice on Burns and His 'Effect' and background in Wikipedia.
By the way, Noise Industries is still offering a free FxPlug, Fxfactory pan and zoom plug-in (Mac). There are numerous tutorials for this effect if you don't have a plug-in. Shane Ross did a video tutorial for FCP at Creative Cow. In the Adobe world, this sort of pan & scan is done by Anchor Point animation; see Chris and Trish Meyer's article on pan & scan at Artbeats and More Motion, Less Control (on adding a human touch) at PVC for good results.
Examples of taking the effect to the next level are also numerous, especially after the movie The Kid Stays in the Picture, noted in another article by Trish & Chris at Artbeats. There's also Bob Donlon's example in Son of Ken Burns, a Richard Harrington video in 'Motion Control' with After Effects, and other AEP resources for multiplane animation.
Update: here's more on multiplane cameras from an old Disney show (filmed: Feb 13, 1957):
Update: Stu Maschwitz added a new product, Prolost Burns, an Animation Preset for After Effects CS6+ that automates the process of creating this type of animation.