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The new color picker on the Custom tab (which Diego showed yesterday):
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You can pick browser colors among others.
More to come...
Bruce showed how to rearrange the IDE. This ability has been there since C7 but it's still a good reminder.
Searching in the current directory can be really handy for searching only certain template files.
You can drag multiple fields into an embed at once.
Set your tab width to 0 and you'll just get two tabs out or in without having to specify the width.
The button to cancel a build is very helpful on big multi-app solutions. (The corresponding menu option has never worked for me in C8 but maybe C9 will be better).
Bruce had some complaints about the app editor buttons.
Ctrl-T in the editor or embeditor, when you're on a class, will take you to the implementation.
Ctrl-F2 adds a bookmark.
Opening a file with the redirection file is a handy way to figure out what the compiler sees, not just what you think the compiler will see.
There are some new classes (may only be in EE).