Being a gadget freak I own a T68I, T39, 6310I, 7650, 8310, and an IPAQ 3970. I've
spent many an hour looking for a unified email solution that would enable me to
access my email from not only my *favorite email client & web browser* but also my
*mobile devices* as well. Eventually I found a solution offered by UPO, here's the
link :

http://www.universalpostoffice.com

They also offer you a variety of available email addresses including such as
mymobile.net, and various other phone/PDA type domains. They're even including 10mb
of storage and POP3 access and aren't charging a cent. For how long I don't know.
BTW, easy access via GPRS/CSD with any built-in phone email client like the 7650 or
T68(I) has!