As far as I know you can suggest commercial sites with the "Standard Submission" too. But there it is not guaranteed that somebody from Yahoo reviews your site.
I think I tried about two times shortly after the start of our page but with no success. Than I read a lot of peoply being angry with yahoo because they never get listed there. So I gave up for a while. But about half a year later I tried again, we where listed and Yahoo became our top referrer. (Now it's google)
So I'd suggest to try it again several times a year. (When you just have nothing else to do. []/testimages/icons/wink.gif[/]).
nòóx
Downhill Rangers
