I own my own e-mail address (not used here), so I can administer it as I see fit. And as far as storage, I have a 30g 5th gen iPod, that's plenty for anything I need to carry with me or access. However, I do have a gmail address, just because I signed up for it a long time ago when the were accepting special requests and you had to wait to be included in the "circle of gMail". Whatever.
In any case, I use my gmail to recieve messages that are high volume such as from professional user groups, association news, and internet association updates... things like that. That way, I can check it whenever I get around to it, and I don't have to worry about it getting shut down because I didn't clean it up. Plus it is anonymous. For professional communication and business transactions, I use my self administered e-mail system. So, I guess you just have to put it in perspective as to what you need for what. Personally, I have my happy medium. Find yours.
Sembetu