I just installed Wordpress today and decided to give it a try. I'm lazy and didn't feel like re-skinning it to match my store. So I just opened one of my store's static pages in a browser, went to View Source and copy pasted the code into Dreamweaver. Then I replaced the content with WordPress' content section, and added the sidebar on the right. Saved over the index.php in the default theme, changed a few of the CSS classes, and now I have my WordPress blog framed in my store's theme. Of course it isn't dynamic, and it will be a pain if I do any major changes to my store, but I think it will work for me.
http://www.partssystems.com/blog/