Lifehacker published a great list of Gmail Tips and Tricks in September 2006.

• Become a Gmail master - how to incorporate several of the tips below
• Gmail Macros and Label Colors - keyboard shortcuts
• Bookmarking with Gmail - use Gmail to store your bookmarks
• Store files with Gmail File Space
• Gmail Drive shell extension - access Gmail like a hard drive.
• gDisk - Gmail Drive shell extension for your Mac
• Send a Webpage with GmailThis - a useful bookmarklet
• Attach any file with Gmail - get around the file type restrictions
• Adding your agenda to Gmail - combine your calendar with Gmail
• Add encryption to Gmail - with a Greasemonkey script
• Use Gmail as your universal email account - managing accounts
• Google Notifier - get mail and calendar alerts
• How to insert images and other HTML into Gmail
• How to filter Gmail image spam - a way to get rid of that .gif spam wit a simple filter
• Gmail as default mail program
• Gmail keyboard shortcuts - a useful and printable list of all Gmail's shortcuts.

See more in lifehacker's Gmail category.

See alsoEdit

• Gmail for your domain
• Gmail sending limit

Links to more tips!Edit

• More tips, from Cyber-Knowledge
• Jim's Gmail tips site
• Gmail tips, the complete collection
• Gmail scripts on userscripts.org