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Different Inbox layouts
Multiple InBoxes
Unread / and Read
Priority inboxStars (different levels, urgent )
Invitations to meetings
Drag and Drop attachments
Setting "out of office" auto-reply messages for people that work part time. Repeating.
Using canned responses - including for multiple signatures
Good overview but not Google/UoY specific enough:
Mail merge
8mins (slightly involved) on creating a Mail Merge entirely within a Google Spreadsheet. Very customisable
Using Labs
Preview pane Lab
Signature tweaks
Moving chat to the right
Create document from an email
Auto-advance
Creating from emails
Creating within tasks
Editing - eg setting dates, different lists etc
Contacts - creating a list
4mins that starts slow, but covers using tasks and attachments from within email.
Gmail notifier
Run advertised programs
Makes mail links from IE etc open up GMail
Setting Firefox to use GMail for mailto links etc:
http://support.mozilla.org/en-US/kb/Changing%20the%20e-mail%20program%20used%20by%20Firefox