Hi Tom,
My first impressions with the site is that I don't believe it will leave a lasting impression with potential clients, by that I think you should consider that a potential client may visit a number of designers sites before contacting any or going ahead with a project, I think your site is lacking some impact for it to be memorable. I don't mean design details for the sack of it, as I like simple, clean sites personally, but I just feel it's lacking some creativity.
In terms of the projects on the homepage, if you're going to display your own logo/identity design I would personally use this image over the logo image you have currently:
Infact looking at your business card design, is there something you can do with the orange box coming in at an angle on the site? Perhaps try something with that to create more of a header area, and then you can start to use the elements to break up the content and sidebars a bit more?
I'd also take a quick look around at some of the CSS galleries that let you
view by colour scheme, look for sites that capture your interest then start to dissect why and how they do, how they break up content, how they lead your eye through the content, and why you might remember them.
Hope that helps to inspire in someway,
Greg