Gmail now has IMAP

This means that you can have full access and control of your Gmail in Outlook or on your Blackberry. Great for people who access mail from multiple locations and devices. Google's help files can get you started

Devices/software supported:

iPhone
Thunderbird 2.0
Apple Mail
(and most other email clients)
Outlook 2007
Outlook 2003
Outlook Express
Windows Mail
Blackberry
Windows Mobile 6
Symbian S60