I stumbled across the newly redesigned site for RGA - R. Greenburg and Associates. They do a ton of motion graphics (Saturday night Live, the opening sequences for lots of movies, commercials - you've seen their stuff).
I am always on the lookout for elegant and interestingly presented timelines (see the Dr. Leslie timeline). Timelines are an interesting design challenge - there is usually a lot of data, sometimes multiple entries per dated section, sometimes images with text. The nature of time means that there will be scrolling - either horizontally or vertically and often relationships are trying to be made across the time units. The span of the time shown in a timeline also plays a factor in how difficult it is to manage - shorter time spans are always easier than large. This dictates how much can be shown in one screenful and that can make or break the success of the overall cohesiveness of the timeline.

The RGA site has a very beautiful timeline, [click on HISTORY], that gives a nice overview of their work since the creation of the agancy. I found it very easy to use. It gives a nice overview of their work since 1977 without being overwhelming. The timeline is elegant and a beautiful example of what can be done with Flash. There are several layers of information shown at once - the years across the bottom to give a sense of scope, the thumbnails of samples within each year to expand on the depth and as each thumbnail is clicked, specific information about the project, which collected as a whole details the capabilities of the agancy without having to read a boring Capabilities section.