I'm guessing you mean short-term closed-ended telecommuting freelance jobs. Having a portfolio of projects you've done, someplace searchable will help. But those sorts of projects on the bidding sites, yeah, you're going to be underbid. Free market at work, bro'.
I'd suggest instead simply putting your resume up on sites like Monster.com, Dice.com and such, and getting in touch with a few headhunte^H^H^H^H^H^H^H^H^H^H recruiters and letting them know what sort of work you're looking for. But they're really generally focused on contractors who'll be working (mostly) on-site.
I don't think the freelance market has amounted to much yet. I mean, seriously, who WOULDN'T want to work from home (or Tahiti or wherever) all the time if their company would allow it? So why would the company look outside for folks?
(By the way, if you find I'm completely wrong, I have a resume I could email you to pass around...)