Sort of.
I tried posting this in the Blizzard professions forum and got, at best, some indifferent comments. I feel, though, that the readers here will be a little more receptive. One of the comments I got was that as far as efficient money making techniques go this one is far from perfect, but it just so happens that it fits my time schedule well. It's also primarily based around fishing, in which everyone here is already well versed.
So it was El's that really gave me the original idea. I was already at 450 in both my fishing and cooking, but I was reading over the cooking/fishing leveling guide here. The thought was this... Could I just go out and follow that guide, fish up the amounts detailed therein, pick up the recipes, cookbooks, quest requirements, etc, and then sell them in one big package?
I decided to give it a shot. I think the first run through was maybe 5 hours total fishing and farming mobs. I didn't buy anything. When I was done, I used a friend's alt as a test subject. The idea was that we could just park the alt in Dal and use it to run the cooking quest and get Northern Spices. Incidentally, I only did 1-400. You can't get to 450 in one sitting, and 400 lets you cook the recipes bought with the cooking awards, so it was a good place to stop.
So it pretty much went off without a hitch. It was about 45 minutes, 1-400, and that included getting to Gadget for the artisan quest. 3.1 has made things easier as you can get artisan at the trainers, and you don't need to pick up the cookbooks any longer.
So once I knew it was doable, I gathered two more sets of mats and tried to sell them. I'm not sure what amount I tried at first, but soon after I set upon 1250g as my price. Things went so well I haven't stopped since.
If people are interested in specifics I'd be happy to share, but one of the complaints about my forum post was that it was too long, and people didn't want to read walls of text. The short version is this.... I've sold almost 70 of these kits in the last 3 months, and have probably made between 60,000 - 70,000g. (I don't always charge full price.)
One thing that makes this work is that I'm enjoying running an in game business. If you're a hard-core raider and most of your time is spent running instances this might not be for you. But if you'd like to try something new and make a little cash, you might want to give it a shot.