The "html" that iWeb produces is an abomination. The worst bit being that it is possible to produce entries that are big images and not actually text. This is a total pain cause you can't adjust the font size, and you can't cut and paste.
That said, I am a strong believer that you shouldn't just whinge and whine about something, but should try and fix it.
So here we are: iWebTextify, a Greasemonkey script that adds a little 'Textify' button to the top of iWeb blogs with image entries. Push the button and the image vanishes to be replaced by the equivalent text.
Unfortunately because of the gratuitous use of image maps to make links work in iWeb, it's not possible to preserve them when dropping the text version in (this is why the script doesn't automatically create a text version which is what I'd really like). It's better than nothing though.
Go try it out on Ben Hammersley's site now!