AOL (AOL) just announced that it is buying the leading technology blog TechCrunch for an undisclosed fist full of dollars. Web analytics company Alexa ranks TC as #302 globally, and 123rd in the U.S. TechCrunch also runs the sites CrunchGear, MobileCrunch, TechCrunchIT, and the popular CrunchBase database. This isn’t AOL’s first foray into acquisitions of blogs. [...]