Please anyone, what is best timeline metaphor you know of? This is great stuff, but I immediately want to interactively browse through the information. For di

Please anyone, what is best timeline metaphor you know of? This is great stuff, but I immediately want to interactively browse through the information. For different parts be able to dive deeper, see high level views, different categories, taxonomies, links to related topics. Not trying to reinvent Wikipedia or hypermedia. But specifically to timelines with a lot of density, it seems there ought to be some nice user interface that could be leveraged for these scenarios.