Yeah, I was a little unsure whether or not to include the last paragraph, but I did up with the idea for the post not thinking about how I could use it to pimp my stuff.
btw: keep the paragraph - pimp your stuff by all means - and (eg) a simple bar <hr> would separate it; that's how 37signals and Joel do it (of course, maybe it's just me who was distracted by it). While it is very effective advertising to integrate it into the story (a kind of product placement), it's harder to do both well than focus 100% on the content.