Now that the game has been out for a month and things are starting to buy swtor credits stabalize it is becoming easier and easier to determine where all of the best money is going to come from. So far the two best Crew Skills I've found to make money from are Slicing and Underworld Trading. The reason both of these are the best is because obviously their materials are in the most demand. Slicing you get your money back 90% of the time when running a Grade 6 mission and occasionally you get an epic Crafting Mission which you can sell for 10k credits or more on the Auction House.

With Underworld Trading you get Grade 6 Silks and Metals which are currently the hottest selling item in the entire game on pretty much every server. The fabrics don't really sell that well on my server and from what I've heard it's the same on many servers... But the metals, jeeze, you can see a single Ciridium metal for 4k and a Mandalorian Iron for almost 10k on some servers! On a normal day with running both Slicing and Underworld Trading missions I can easily make over 500 - 750k Credits. If I get really lucky and can run multiple unlockable missions or I get a lot of crits, I can make over 1 million credits without even moving a single time.

Of course if you want to maximize your Credits per day you'll want to move, I'm just trying to put the awesomeness of these Crew Skills into words.
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