AOL has added another blog to its stable, snapping up Michael Arrington's TechCrunch for an undisclosed fee today.

Tim Armstrong, AOL's CEO, made the announcement on stage at TechCrunch Disrupt 2010 along with TechCrunch founder and co-editor Arrington and TechCrunch CEO Heather Harde. They actually signed the deal before the conference audience, although they did not say anything about valuation during a conference focused almost exclusively on start-ups, venture funding, and exit strategies.

TechCrunch will operate as a wholly-owned subsidiary and Armstrong promised Arrington that he would have complete editorial freedom over content posted on TechCrunch. AOL operates tech blog Engadget in a similar manner.

More: http://news.cnet.com/8301-30684_3-20017892-265.html