Hal,

So far I didn't hear about any publisher that uses full-time tech reviewers, but this is the kind of job you can do in your spare time. And it's an easy job, too - all you have to do is to say as many bad things as possible about technical text some other guy (or sometimes girl, which makes things a bit more difficult) wrote :)

Anyway, good luck! I'm sure you'd have no problem "persuading" a publisher to give you the chance to try it -- most tech review guidelines suggest a number of comments per page, criterion that you would most certainly meet (give them a link to these forums and they'll see:)

Thanks again for the feedback you provided for my readers...

Cristian.
(Author of "Beginning ASP.NET 1.1 E-Commerce" and other books that you might like (tm) - http://www.CristianDarie.ro/books.html :)