Mark Hulbert has produced a newsletter for years that follows about 200 other newsletters. In his newsletter he will compare rates of return for each of their model portfolios, etc. It helps to cut through some of the hyperbole common in all newsletters. Currently I subscribe to The Investment Reporter (follows mostly Canadian stocks), The Turnaround Letter and a newsletter written by Richard Lehmann called Income Securities (CEF, MLP, Preferreds). I use all of these as idea generators for further evaluation.