Up date on IMPLODED LENDERS:
200 Major U.S. Lenders Have ‘Imploded’
From Implode-O-Meter (A popular web site that tracks failing or "imploded" lenders):
"Imploded" lenders: The "imploded" status is somewhat subjective and does not necessarily mean operations are ceased permanently: it can mean bankruptcy filing, temporary but open-ended halting of major operations, or a "firesale" acquisition. The Companies include all types (prime, subprime, or a mix of both; retail or wholesale; subsidiaries and entire companies). Note: Companies listed here may still be operating in some capacity; check with them before making assumptions.
Ailing lenders haven't shut down, but they're significantly scaling back or are (or recently have been) in manifest financial, legal, or operational distress. Unfortunately, most of the industry now falls under this description, so we are forced to reserve this list for the more glaring cases or those which we happen to have more specific info about.