This week I added the following snippet to my .vimrc (.vimrc.after if you are using Janus):
1 2 3 4
CTRL-k to next and previous buffer and
CTRL-h to next and previous tabs.
It is by far the biggest productivity boost I have gotten out of my
Buffer and tab switching has never been that fast and easy.
Macbook tip: remap your CAPS LOCK key to CTRL.