I use gmail alot. I really like it. Lately there was something bugging me about it though. Gmail can pop your mail from any other account and pull it into gmail. The only problem is that it is not always very timely, sometimes it's over an hour between popping the accounts, and plus it will pop spam. So I decided that I was just going to forward my emails to gmail. It worked great, spam was filtered and mail was instant. As a plus, when I replied, it replied as the email account. Granted it still put in it's sender header, but still, it's better than the pop way of doing it.<br />
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Just in general, as a side note about gmail, it seems that they are gunning more and more for business users.