new hosts appearing between 2011-07-30_0500 and 2011-07-30_1000:
www.ed.gov
www.exacttarget.com
www.gamasutra.com
www.harvard.edu
www.informationweek.com
www.mikrotik.com
www.qwest.com

hosts disappearing between 2011-07-30_0500 and 2011-07-30_1000:
www.cfos.de
www.uni-muenchen.de