Taking on the task of trying to list every business-oriented blog has to be one of those "labor of love" projects. A look at the list of blogs Rick has compiled to date is evidence that most "non-personal-diary" (some would say non-personal-diarrhea) blogs continue to focus on technology and politics, not business.
While Rick has put together a decent representative list, with only one tradeshow, one PR and a couple of general marketing blogs, there's still a lot of territory to cover and content to offer before many mainstream marketers will get excited over this medium.
I try to dig up content on trade shows by searching engines like Feedster and Daypop with keywords like "trade show" or "conference". Sometimes (OK, once in a blue moon) I come across real news that's interesting.
Most times I come across weirdness, much of which never makes it to TSMR. Today I'm making an exception.
As one of the last two remaining bloggers in our industry, I couldn't give a rat's you-know-what if this "trend" takes off at shows. Blogs by trade show attendees are simply not interesting except to the extent that they discuss a product being seen for the first time anywhere.
However, blogs ABOUT trade shows (like this one) are at least somewhat entertaining. Even if only to me.