What's the ratio for Yahoo to Google?
 

What i mean is, is there a way to figure out, what you would get traffic wise for say, "xxx" on google, and "porn site" on yahoo?

Yahoo is so much easier for me to optimize for (on page factors), and i seem to do ok at it. But google, is a different matter entirely.

Anyone know of a tool or site that can figure this information out?

i would love to know that too?? i do so much better in yahoo serps but traffic sux :( #1 out of 12million for competitive keywords only brings like 300 uniques a day WTF???? and alexa shows yahoo's overall traffic much higher than googles, so why the #'s difference?

all depends on the keywords youre after - there is a wide spectrum difference between say a keyword like sex or porn between the two indexes - wheras something like the #1 spot for vigrx is about the same sales wise - traffic is huge from Google comparitively but conversion ratios are about the same.
As far as comparative for each word - the only way I would know to check that would be to have an overture advertising acct and a google adwords acct and then check their estimated traffic to the ads for the same keywords - might give an idea of the differences - but again its such a wide difference for each keyword.