Here's a good "blog" started recently. The writer is a magistrate who posts a lot on the newsgroups, all anon of course:

http://thelawwestofealingbroadway.blogspot.com/

edit: Also interesting is the "The Policeman's Blog":
http://coppersblog.blogspot.com/

See the links down the right for many similar ones, I've only just seen this one and will do lots of reading later. These job-specific ones are very interesting.

Gareth