Dubya held his final newser this morning. Here's a tag cloud from Twitscoop:

Bush's final newser got people tweeting, as this chart (captured shortly after the newser started) shows:

And here's a BBC tag cloud analyzing Bush's eight State of the Union speeches:

There's lots of other charts attached to that page, so click through.

It would be interesting to see word maps of other modern U.S. presidents' SOTU speeches.