How can I setup IMAP for GMail on my iPhone?
Google has recently added IMAP as an available protocol for their GMail. This is a long awaited feature for GMail users (not just GMail iPhone users) as it allows for true synchronization between GMail and offline mail readers.
UPDATE: Now iPhone users can simply choose "GMail" from the list of built-in accounts when adding a new email account. Navigate to Settings -> Mail, Contacts, Calendars -> Add Account -> Gmail and enter your account Address and Password. Touch "Save" and it will connect automatically.
Old information follows:
Google has offered two sources of easy to follow instructions, a text version and a video, for setting up GMail reading via IMAP on the iPhone. Both are copied below: