There's a new kid on thNew WoW Gold Guide from Valkor e  wow goldgold making block with a new wow goldguide. It's called, somewhat wow gold unoriginally, Valkor's Gold Making Guide.
It costs real money so, in the interests of possibly saving you some cash, I put down my $37 and bought a copy. So many of these gold making guides are outright scams or, at best, weak copies of each other, or stuff you can find from browsing a few forums.

Was it worth it?

Overall I was impressed with the quality and depth of the guide. This definitely isn't one of those pathetic “me-too” guides so readily available. I was surprised to find many techniques in this guide that were new to me. We are all aware of the gold farmers; now you can see the ways they make so much gold so quickly. There's a mass of stuff in the guide including a lot of reference material which must have been a major undertaking to compile. A lot of the techniques are for higher level players but there's also a section for players under level 30. A few minor niggles over the organization but nothing major. To be fair there's a lot of information to sort and present.

As with all of the gold making guides there's a danger of them getting out of date quickly. The copyright date on this guide was originally February 2007 but it has been updated for may 2007. The author also promises regular updates in the future.

Overall, I'll give it my vote for the best gold guide available at the moment. You can read more, or get your own copy