I've recently finished a project using the Arduino to control LED lights, and I would highly recommend the RBBB boards. It depends on what you're connecting the board to, but for my particular application, it worked out great. I had tried to assemble the components for a standalone atmega168 on Radioshack perf boards (two different kinds, the ones with copper pads around each hole, and the kind set up like a breadboard), and the traces kept separating from the board and breaking connections. In the end, buying an $11 RBBB turned out to be way better.
I didn't realize from the website's description and picture that the board would be so tiny, it's great. It's not very much bigger than the size of the chip itself. It took about 15 minutes to assemble and worked right away.
Like I said, I don't know what you need for your particular application, but my experience has been great with the RBBB. Not much more than you'd pay for the parts themselves for all the parts + a PCB.