Hi Mark,
First of all, good, clean and simple design.
I am not a fan of guestbooks. This concept is somewhat dated and when you don't have many comments it makes your site look vacant. So unless the comments people add to your book add value and build credibility (comments from people you've sold products for, etc.), I would think twice about leaving that up.
Add a picture to your About Me page. Credibility is a real big factor for your niche and adding pictures just helps build that trust factor a little more.
Also, did you know ebay has an affiliate program through CJ.com? I noticed you link to ebay at the top of your page. Might as well earn commissions if people happen to buy something. If you're not a member of CJ.com you can join for free and then you join the ebay program from there.
Hope that helps!
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