Cash and cash equivalents (as of 3/31/2011): $3,226,438
Loss before other income (for the 3 months of 2011): ($3,097,283 )
"Other income" consists primarily of the insurance reimbursement to cover legal costs related to the defense against the class action lawsuit.
This tells me that Prosper has ~3-4 months to live (as of 3/31/2011) unless they get a venture capital cash infusion before then.
That places Prosper's closing (without additional VC) in the June-July timeframe as was predicted from the 2010 10-K.