"Law firms that have long advised private equity giants on mergers and acquisitions -- and often bill more than $1,000 an hour for their services -- are joining the industry's latest treasure hunt: prying open America's 401(k)s.... All told, nearly $13 trillion is sitting in 401(k) accounts and other defined-contribution retirement plans. Tapping into that trove could help plug gaps left by deep-pocketed pensions and endowments."  MORE >>