Anyone that is familiar with PPC aka sponsored search, knows the high volume keywords that perform are usually VERY PRICEY!

The real estate related keywords for my city run from 2-4$ a click for a top 3 position on Overture and Google Adwords. 

Overture is now Yahoo Search Marketing as you may know.  In the past Overture did the sponsored search for almost all of the other search engines such as ask.com and msn.com.   That isn't the case today.  MSN now has it's own sponsored search program that works just like Google's.  

It would seem that not everyone is aware of this. Today I was able to get a 2nd position for 67 cents a click for a keyword that would cost me over 2$ for the same position on Google or Yahoo.  

I know MSN is the least searched of the three, but that doesn't make the searches it does get any less valid.

So I recommend getting in while they are still cheap. Couldn't tell you how long it's going to last, but every little bit helps, right?

https://adcenter.microsoft.com/Default.aspx  this is the link, and they only require 5$ to start.  If you are familiar with Google Adwords, you should have no problem using the MSN interface.