Warburg Pincus participated in a $26M Series A in CrowdStrike in February 2012. Tiger Global participated in a $10M Series A in BelezanaWeb.com.br in May 2012 and a $8M Series A in Olacabs in April 2012.
Have they participated in any more? It seems like one off investments by giant PE firms probably aren't helpful to any startup that doesn't already have a personal connection to those firms.