CapitalSource's Especially Warm Reception Investor conferences put on by public companies tend to be upbeat affairs. That was indeed the case at    CapitalSource Inc. 's annual presentation to research analysts. About 125 people -- mostly the youngish, mathy types who follow financial service companies for Wall Street -- were crammed into the Fairmont hotel in Foggy Bottom to listen to a procession of crisp, data-laden speeches about CapitalSource.