Hmm... I've learned from GMail. I choose a mail interface with a clear delete (instead of the nebulous "archive") and the ease of mutually exclusive folders instead of the lack of specificity of overlapping tags, and I got just as much spam in Gmail as I did in Y!.

So, I guess lots of folks have learned from GMail... that GMail is not really right for everyone. If you love tags, cool, but there's something to be said for email that works like one expects email to work.

Wouldn't mind better searching in Y! mail, however; Google did do a good job with that, not surprisingly.