I'm seeing 12 to 20 minutes delay as well... and it is 5:45 PM, so the buisness hour "peak" is over.
I guess I'm in the minority since most people don't seem to care, but I think SBC/Yahoo owes us at least as good a service as we can get from almost any dial-up. On it's worst day I don't think there was ever a 45 minute delay with Mindspring in Lanset.... two ISPs I've had experience with over the past 3 years.