Paula,
The only catalog I know of is at: http://www.techwriterblogs.com which
Tom Johnson set up a couple of years ago. It's a list that you can add
you own blog to, so I don't know how comprehensive it is.
Have you tried going to Technorati and searching for blogs that list
technical
I have a long list of blogs on my blogroll here:
http://www.idratherbewriting.com/blogroll/
Part of the problem with categorizing blogs is that many times people write
about various topics, rather than specializing their content. Keycontent.org
also has lists of blogs, though I'm not sure they
