I just finished using Crowdspring for the first time and am very impressed.  I needed a logo for one of the projects I am working on and decided to give it a shot after reading a few positive pieces on it.

It is pretty straight forward.  Post a project, set a price ($200 minimum, I believe) and designers submit ideas.  There is a forum for feedback and guidance as well as a really simple way to approve and pay the creative.  I posted a basic logo project for just over the minimum and received well over 50 submissions including many original concepts as well as iterations of the same ones.

A clean logo can go along way to project your company's brand and Crowdspring offers a great way to add professional design to any project – so please, no more Powerpoint drawn logos…