March winds bring April showers. And April showers bring... a great opportunity to buy ultra-high-yield dividend stocks. I suppose they bring mayflowers too, but mayflowers won't make you a lot of money over the long run. Seriously, there are several great ultra-high-yield dividend stocks to buy in April. These three especially stand out. 1. Ares Capital Ares Capital (ARCC 0.27%) offers such a high dividend yield, at 8.68%, that you might wonder if it's sustainable. Don't worry: It is. The company has paid ...