just got sent this link and thought I would share it here. It's from an elance guy I met in Melbourne but I think anyone can use it.
I tried it and it works, except it took about 2 days before the credit got applied to my account.
Here's the link to get $50 free credit:
Don't think you can use it if you already have an account, but I know that some of you are just starting out and $50 on elance isn't too shabby.