… it’s not POP3/IMAP.
Like many of you, I also have a GMail account (tom.sommer at gmail dot com).
While I find GMail nice in many ways, especially at threading mails and mailing lists, I cannot get use to the idea of checking my mail through a browser. I normally either have my lovely Thunderbird minimized and a popup appears when I get new mail, or I just click the Thunderbird icon in the bottom of my desktop and bling it will open and check for new mail. With GMail I have to keep visiting the GMail website to see if there is any new mail. I don’t know about the rest of you, but 1 GB space is not enough to make me abandon POP3 or IMAP.