For techincal blogging (like this) iWeb is weak.
The total MacOSX integration -- pictures, podcast, etc. -- is nice. It's very cool for my travelogues. But for code samples and the kind of customized HTML widgets that are required by Technorati, it's too hard to deal with.
The size of the iWeb pages is magnificent. Reading a posting is an undertaking. I don't really like that, since this is mostly simple text; the ultra complex graphics aren't an asset.
For now, I still have to mess around with the ShareThis link. I'm not sure if I like the sophistication of Share This or if I want button-by-button links to digg, facebook, tweet and track, stumble upon, reddit, del.icio.us, and yahoo buzz buttons on each post.