This is pretty cool. MSN Search beta solves any polynomial equations you enter into its search box.

MSN Search beta result for a quadratic equation

I tried with higher degree polynomials but it seems it can only solve up to cubic equations (try x^3 -27 = 0). Quartic equations, like x^4 + 6x^3 - 5x^2 - 10x - 3 = 0, return a vanilla search result page.

Via Neil Turner via Chris Pirillo.