ImapArchiver is a tool which can be used to save the all imap account into a local directory/archive. The ideal objective is to used it with cron to automatically make a back up of your imap account
Gnoptray is a mail notification utility for GNOME, that will support multiple accounts. It will sit in the notification area and display a total e-mail count. Hopefully, it will do a better job of previewing e-mail than current 'biff' like programs.