In case you missed it, two new User Tips were posted this week.
Fast Aperture library switching using the Dock by Rudy Ephraim
Quicker Rating using Numeric Keypad by Matthew London
Remember, you can always post your own Aperture tip! Just click on User Tips and write what you like; I’ll proof and reformat and post them. Unfortunately you can’t add photos yourself (permissions oddity here), however you can link to photos hosted elsewhere, or just email the ones you want posted to me and I’ll drop them in for you.