Instant -
you can also get yahoo traffic if your listed in google, yahoo uses google for their secondary search traffic, so if there aren't many links in the yahoo database that match they surfers search they will then get the web links which actually come from google
How well are those 1000/day hits converting for you ?? I get 2K a day on one of my domains from yahoo, and I'm getting around 1/600 at maxcash.
Tim