GmailVault is a utility that allows you to back up your email and chat, along with all labels, from your Gmail account onto your computer. It supports incremental backups and offers you convenient, offline access to all your email communication.
GmailVault is free software and meant for personal use.
GmailVault is brought to you by DigitalGlue, an Internet Solutions company, that has interests in security and scalable web architecture. DigitalGlue is also the maker of MailVault, a universal email backup and archival solution for corporates, that works with all email systems.