Letter Opener converts winmail.dat attachments on the fly, so you can actually see and use the attachments the sender intended you to have.
MsgFiler is the fastest way to move, copy, and label messages in Mail. It also offers useful features for navigating and managing mailboxes.
Mail Act-On is an incredibly useful Mail plug-in that lets you invoke rules using the keyboard—if you can perform an action using Mail's rules, Mail Act-On lets you do it with a keyboard shortcut. It also adds Outbox rules to Mail.
MsgFiler 2 lets you quickly move, copy, and label messages in Mail. (MsgFiler 2, a Mail plug-in, has since been replaced by MsgFiler 3, an application.)
DockStar enhances Mail's Dock icon to provide finer-grain new-email notifications.
MailFollowup gives Mail a Follow Up feature that lets you quickly re-send a quoted copy of a message, with or without follow-up comments.
MailHub is a Mail plug-in that adds powerful new features for managing your e-mail messages and mailboxes.
MailTags lets you add searchable tags (similar to keywords or categories) to e-mail messages. It also lets you add notes, set and view priority, and assign due dates to messages.
Flagit is a simple add-on to Apple Mail that adds multiple flag and deploys a creative flagging method, aided by flexible and extensible flagging tools, that's both attractive and utilitarian.
Mail Scripts takes advantage of Mail's AppleScript support to provide a number of new features, including easier rule creation and the capability to archive messages, find and remove duplicate messages, schedule messages, and perform complex Address Book searches.
Rocketbox enhances Mail's message-search capabilities thanks to advanced search options, by-person searching, better search-result displays, and faster performance.
Herald lets you monitor incoming e-mail messages while you work in other programs.
MailRecent modifies Mail's Message and Mailbox menus to make it easier to move or copy messages to recent mailbox destinations and to view recently accessed folders.
MiniMail lets you view—and work with—incoming e-mail without having to keep Mail's main window visible. (MiniMail has been replaced by Mail Perspectives.)
MailCM gives you a quick way to copy specific parts of selected messages for pasting elsewhere. It also makes it easy to add to Address Book the sender(s) or recipients(s) of multiple messages.
Mail Attachments Iconizer gives you more control over how Mail displays and sends attachments.
QuoteFix is a plug-in for Mac OS X's Mail that "fixes" replies and forwarded messages by placing replies below quoted text, stripping previous signatures, and removing quotes above a certain level.
Letterbox gives you an early taste of the next major version of Mail by letting you move the preview pane from the bottom to the right-hand side of Mail's main window—a more-efficient setup on a widescreen display. It also provides some useful tweaks for enhancing the presentation of message lists.
If an update to Mac OS X "breaks" some of your Mail plug-ins, MailPluginFix may be able to update them to work with the latest version of Mail.
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Similar to Letterbox, Widemail moves Mail's preview pane from the bottom to the right-hand side of Mail's main window. It also modifies the message list to display two lines of information for each message.
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GrowlMail is a simple Growl plugin that displays a preview of each new Mail message as it arrives, letting you monitor incoming e-mail when you're working in other programs.
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MiniMail lets you view—and work with—incoming e-mail without having to keep Mail's main window visible. (Mail Perspectives is the successor to MiniMail.)
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If you normally keep the Dock hidden, Mail Unread Menu lets you keep track of unread e-mail messages using a systemwide menu-bar icon.
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MailSteward is a database specifically made for safely archiving e-mail messages.
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MailTabs, currently in the beta stage, brings Web-browser-like tabs to OS X's Mail app.