Agree - why go for $75 when you can get $100 free? Don't know if there's a code for it, but if you go via the link half way down my homepage you get $100. I spent two hours hunting for more than $100, but that's the highest I could find.
Code : USDM0085B For $75 I open a account with yahoo overture yesterday, without using any Promo code. So I email and give them the promo code. 2 days later they reply me with $75 credit into my overture account.