> Has anybody else been recieving yahoo junk
> mail claiming that they have opted in, and
> apparently their yahoo groups account is the
> source of the opt in.

No.

I am perfectly content with Yahoo Groups. I think we all probably have
better things to do than to replace something that works well. I am
subscribed to several of their groups, so a replacement for just one of
them will only make things more complicated for me.

Cheers,
Tobias