Userscripts.org

Script to use Air Skin in GMail (Google Mail), Google Calendar, and on Google.com and now also an Google Reader

Netbook Mode (show only message pane). Hides the ads, so the message pane is full width, but ALSO shows the gadgets (maps, events) as a popup. Overall, more space for your messages :)

Reminds you to attach a file to your email if it appears that you have not.

Forces all mailto links to open in GMail

Hide all advertisements and right side frame on Gmail / Google Apps, get extra work space.

For new version of Gmail: when viewing a message/conversation, the advertisement box on the right is removed and messages and reply box occupy the full width available. Long titles are optionally truncated.

Makes "mailto" links open in your favorite web-based email account, instead of a pop-3 client (like Outlook, Eudora, Thunderbird, etc.) Supports Gmail, Yahoo Mail, and Google Apps Mail. [UPDATED Dec 2011]

Never see how much spam you have, since you don't care about it anyways :)

Pimp.your.Gmail!

Use this GreaseMonkey script to reclaim the hefty area that the GMail's searchbar and Logo area take up.

Adds a 'Smart-Delete' button that enables/disables itself, depending on whether or not any items have been checked. It works with all applicable Gmail pages, labels & mail items.

Makes conversations occupy full width by removing advertisement block on the right. The links above the ads are kept and placed conveniently next to the conversation title. The "map this" and "add to calendar" things are also kept.

Opens the Gmail Compose window when you click on a mailto url, instead of opening some desktop application (Outlook, etc.).

Adds colors to Gmail according to label

Applies different signatures (look for 'Use identity:') for writing gmail messages when different From: address is chosen. Right now, data has to be configured directly into this script. Click EDIT to configure your email and signatures: email_arr...

See from your inbox what kind of attachment an email has

Get back Muzzle Lab in Gmail -- Muzzle was the lab which let you hide the status of your friends in the contact pannel of Gmail. It has been removed from the Lab list on the sad 25th day of February 2010 -- Tested on FF3.6 and Chrome 4

Uses the RapidShare exploit to download EXACTLY like a premium user, NO/NaN PREMIUM ACCOUNT REQUIRED.

Adds a "Mark Read" or "Mark Unread" button to Gmail pages (active only when mail items are selected).

Extra (customizable) keyboard shortcuts and macros.

Greasemonkey script for Firefox to change the appearance of GMail

Gmail Air Skin with ads-block for the new Gmail offical "Classic" and "Default" theme.

[v0.53] Automatically skips any sponsored links (and optionally tips) detected in the Gmail Web Clips feed. Also optionally hides the sidebar that includes adverts when viewing an email thread.

Removes all ads in Gmail, including Web Clips at the top of Inbox. Updated for the most recent Gmail design.

Deprecated by Gmail Addons at http://userscripts.org/scripts/show/19956

Append the function to apply the mail template, when writing a mail.

Allows you to make the Inbox Collapsible and loads your choice of Google Calendar, Reader, Notebook, Groups etc... seamlessly into the gmail interface below the inbox (rather than the sidebar) using a collapsible box. Works w/Google Apps Accounts....

Access recent conversations in one painless click.

Optionally colors label names (when they have a #color suffix)

(2005-04-03) Hides Gmail content-sensitive ads.