The source site for this is: http://www.yuxt.com

Here is a nice idea for a bright, colorful Web 2.0ey logo design. It is clean and appealing. Love the gradient of colors in each of the letters. Gray hair-line border and the slight drop shadow make the logo stand out. The transparent layer of white half-circle over the entire logo makes it have a reflective or glossy look. Nicely done!