List of Improvements in Mac OS X 10.1's Mail 1.1 vs Mail 1.0

From Apple:

"- Message disposition is now displayed in the message list (i.e. whether a message has been replied to, forwarded, or redirected)
- Message flagging
- New encoding menu (in the Format menu)
- Mailboxes can now be renamed and moved
- Support for IMAP servers that require a path prefix (UW IMAP, CMU, etc)
- Transferring and deleting messages significantly faster
- New mailbox importer
- All messages now go through Outbox first, then to Sent Messages such that the sending status of a message is more obvious
- New column in the message list denoting messages with attachments
- New rule actions for auto-reply and auto-redirect
- Deferred download of IMAP attachments
- Revamped Drafts folder with indication of drafts not yet sent
- Undo now works for undeleting messages
- Improved AppleScript support
- Fixes for scrolling behavior in the message list when new messages arrive
- Improved attachment compatibility with other clients
- Faster launch time
- Handful of new toolbar items
- Better overall application responsiveness and performance
- Better performance in low bandwidth situations
- Support for more SMTP authentication methods
- Lots of bug fixes, of course"

These are welcome improvements. Unfortunately, with v1.1 we get more frequent unexpected quits, get more frequent long spinning color wheel cursor pauses and email with HTML (mostly advertising spam) takes much longer to open.