"I hope some useful blogs will be produced by this. At the moment I did not see any.”

Praeternatural Play and Unlimited Freedom are two of the more prolific and well written invisiblogs.  Whether or not they’re “useful” depends on your point of view.

The current arcane signup and posting procedure seems to discourage non-technical writers.  We’re hoping to improve the situation soon.

These are indeed very good examples of a good blog. It is however not clear that they would require the Invisiblog service. They could have been created with any other blog-tool. Their content seems pretty harmless to the author.

But I guess that is up to the author to decide and not me.