I think there are manifold of the sources of the sites are available.

i already heard about Odesk, and my friends using that, I will try that also to get free lance job..

Socialbookmarking-list site is best for SEO work.

I am using a getafreelancer before and it really helps a lot.

different forums, like DP has very good opportunity for SEO

There are manifold of sites are there, but we can find on the google, which can give us preferable sites of the seo.

I got job in both website getafreelancer and odesk, but as per my opinion is concern, there is no assurance in both website that payment always be secure, I think if you want to have an assurance about payment, Try to do your task correctly and accurately, and build a good Relation to the employer,(this is just base in my experience and opinion Peace)

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Good SEO work can also help improve an existing sites. Odesk , digg.com also best for SEO...

I think getafreelancer is good..

Getafreelancer is pretty good... I have used it a few times.