What Angel Investors Want Now http://www.youngentrepreneur.com/startingup/startup-finance/what-angel-investors-want-now/
How to Get International Angel Investors for Your Startup http://www.huffingtonpost.com/steve-strauss/angel-investors_b_2975056.html
Finally, actual data: Series A crunch will kill 1,000 companies, $1B in angel money http://pandodaily.com/2012/12/19/finally-actual-data-series-a-crunch-will-kill-1000-companies-1b-in-angel-money/