Seems the titans of Wall Street, and here we mean the private equity buyout shops including Warburg Pincus, Carlyle, TPG, and KKR, have amassed $500 billion to buy companies. Their problem? Not enough to buy and rising prices for what is out there. Plus it's a lot harder to leverage deals with debt in a post-bank-meltdown world. Read the full article. (More private equity stories.)