Another good one, Steven. One thing I'll add (and a big lesson from Dale Carnegie's "How to Win Friends and Influence People") is that the quickest, surest way to get people interested in you is to take and avid and genuine interest in other people.
Zero sum thinking (that a job given to creator x is a job lost to me) will get you no where. Rather, a pay it forward mentality, where you reach a hand out and support other creators will build a ton of good will that is going to help you later on down the road.
But, these things do take time. First when you're just getting started, and especially after you've been doing this a while and start to think you're ready for bigger opportunities, it can get frustrating. But there are no over night successes in comics. And would you really want there to be?
I'm getting ready for some conventions this month and next month and was flipping through some issues of Super Seed I haven't looked at in a while. I realized that just in the back pages I've worked with a bunch of talent who have made major strides in the past year. I've got a pin-up by the artist on the recent Farscape mini who is doing great work, and had some coloring assistance from a guy who is inking for DC now. These are both guys I really enjoyed working with and am not surprised they're having increasing success in the industry. I'd recommend them for work...and obviously others with more pull than me felt the same way.