Cool shortcuts in Avid Media Composer

To keep all layers in sync without selecting an A or B side in multi-layer trimming
When in trim mode, hold down SHIFT+OPTION+ADD EDIT (MAC) / SHIFT+ALT+ADD EDIT (WIN)
This will add an edit on all layers and you can then trim all layers at the same time, and keeping everything in sync.

Searching for that perfect piece of footage you used and have 100s of bins?
The FIND BIN command will find the clip or sequence in whatever bin it is located in.