Link: Technical Web Typography: Guidelines and Techniques
An article I wrote for Smashing Magazine has just gone live. It's all about technical, micro-typography and how it can be used to great effect on the web. It won't teach you how to be a better designer, but it should show you how to best set type on the web.
It's a pretty epic offering but I assure you, it's worth it.
It is worth noting that Wordpress' editor has stripped some of the semantic and (ironically) typographical niceties from the post. I have a semantically rich original copy knocking about that I drafted the article up in (in HTML)