I just launched netpox.com as a webmaster's marketplace. It used to be a web blog. Please check it out and let me know what you think.
Not bad. Blue border seems to be a bit thinner on top then the other sides, maybe just me, but bigged me a little. Also you will need many more ads before anyone is going to think about signing up and posting. The thing with marketplace sites, is you need strong traffic, otherwise they will never get of the ground.
Agreed, the blue border on top appears more narrow than the side bars. Also, with contrast in mind, the shade of blue utilized is rather harsh on the eyes. Overall it is a nice design with a sleek interface.