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Nice job on these, Nate. You've definitely covered your biggest concern, matching your website. They match very well (love the site too, by the way... especially the tight kerning on your headers).
There are a couple things I can nit-pick at.
The first thing I noticed was that the contact information was bolder than the logo type. I'm not sure if that was intentional or not. It's not really a bad thing, but something to consider. You might also want to add your title to the business card. Some people like to know who they're speaking to within the company (in this case, it would seem obvious, but you never know).
Also, for the background, you might consider adding a little bit of that nice wood texture you have on your website, to dress up the card a little bit. It may be a matter of my own taste, but again, just something to consider.
I love the simplicity of your letterhead, and I don't think you need to do much to that.
The back of your card would look awesome with a spot UV on the darker black areas. If you decide to go a different route, you might need to lighten the background just a bit, or darken the text/logo further. I don't think you need to make it white, and I don't think you need to turn it 90 degrees as Ovi suggested (sorry, Ovi!).
Nice job on these, and I love your designs! Keep up the good work.

Thanks for the feedback Carlin, these are things that I will definitely look at.