Something I’ve been doing recently is making a screen recording of my talks using QuickTime on my Mac. It’ll record both my voice and my slides as I flip through them. It’s a much better experience than just posting contextless slides.
On the other hand, I do love when slides act as a brief summary of the talk because I often don't want to spend 45 minutes to listen to a talk when all I want is a summary or if I don't yet know if the talk is interesting to me, or if I can't watch a video right now for whatever reason and want to know if I should bookmark it for later. But thats not the real reason I like slides to be made available.
The biggest reason of all for you to put your slides online is that I have seen countless videos of talks where the slides are unreadable (too small, too blurry, too low resolution - whatever) or the camera focused completely on the speaker and never showed the slides at all. Not all videos make the slides available (eg if its on vimeo or youtube, rather than something like infoq) - in these cases, often the video is worthless unless the speaker makes the slides available on their website.
The point is just getting the whole story, together. And, personally, I prefer something like a blog post because I can read faster than I can listen to the whole talk. Even if I miss out on some of the funny or other moments.
Did you look at the link I posted? It's a far more enjoyable, engrossing, and informative format than the equivalent multi-post blog series.
..edit: I like Markdown too much.
Which I personally take as evidence that I'm either a) writing slides the way I want to, or b) writing really bad slides.
I hate slides being put up, it makes people put stupid crap that doesn't belong in slides, in slides.