Brief but nice profile over at MarketWatch of 4 investment personalities that are definitely non-mainstream. Hussman and Grantham, in particular, I find to be very solid thinkers and lucid writers. If you aren't reading Hussman's weekly commentary, you should click on the link in the right sidebar and do so. Now! As for Grantham, you have to register over at GMO but its free and they publish commentary and research from time to time. Managing the kind of money they do, its probably not high on their priority list to publish much of anything for non-paying customers.
Anyway, go check it out, and read Hussman and Grantham's writings when they come out!