Bloomberg Businessweek has now posted a good article "Berlin Cracks the Startup Code" which expands on the earlier ReadWriteWeb article and identifies some of the venture capital firms active in Berlin and some of the Berlin start-ups that have received funding from international venture capital firms. One key takeaway is that more than 500 tech start-ups were founded in Berlin in 2011, an impressive number.
Link to the Bloomberg Businessweek article:
http://www.businessweek.com/articles/2012-04-12/berlin-cracks-the-startup-code
Link to my prior post on East Berlin's startup scene:
http://www.allenlatta.com/1/post/2012/02/east-berlins-start-up-scene.html