Advertising website where you bid

Hey all, I'm looking for an advertising website where you bid to be the highest.
I can't remember what it's called - but you could search publishers and upload your ad, you would then bid on their particular adspace.

Anyone know of some sites like that?

thanks

edit: I think the name started with a "P"

 

Are you thinking of www.projectwonderful.com

 

writesalot is correct, i think this is what you are looking for, good luck.

 

ah yes, that's it!

I forgot and I couldn't for the life of me remember! I also had a difficult time finding it on a search engine.

thanks very much!