Freelance Portfolio Blog - Topics?

[Ben]

I've got a portfolio site, which
contains some past projects and some general "work with me" information. I'd like to expand on the site (for SEO purposes are well) but also to give people a
'personal' feel for me, rather than just a 'cold(?) professional' approach.

I'm thinking that the blog aimed at potential customers so web-
savvy topics about CSS and AJAX would be over their head and not really relevant, or would they? What topics/articles do you think would be viable for this type of blog?
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Do you think it's a good idea, or would it give people more reason not to contact me?

[Dave]

If you can write well then it
could show that you know what you're talking about, and possibly make you more appealing to a prospective client.