I do just that Jason, with using my Comcast account only for personal correspondence, and have several Yahoo and Hotmail accounts for other shenanigans.
Unfortunately something's going on that Matt and I seem to be stuck with... I was out all weekend and tonight had 3 of those gibberish SPAM's in my in-box. I've been good about not giving that addy out and still get hosed.
I don't even use that to correspond with people I don't know well... Nothing like meeting htat one bonehead left who insists on sending around the "chain letter" that sneaks your addy in the list.