Yeah, we all know how weird and annoying those YouTube channel art sizes are.
So, here are a couple of templates you can send to your graphic designer, or work on yourself, to make sure your YouTube channels are looking spiffy and awesome.
Photoshop Template:
http://well-fed-realtor.s3.amazonaws.com/YT_Photoshop_Template
Fireworks Template:
http://well-fed-realtor.s3.amazonaws.com/YT_Fireworks_Template.png