Writer’s Dreamtools offers a neat timeline of real-world historical events by decade, from the 1650s to the 1990s.
It’s full of snippets, not depth — perfect, in other words, for GMs looking for historical details who don’t want to wade through lots of text to get to them. Topics include bad guys, what’s “in,” entertainment, religion and more.
My only quibble is the format, which runs together on the screen; it could use a bit more differentiation. That definitely doesn’t keep it from being useful, though. (Via kottke.)