Here I am for another great tip. One of the things that lack in Sharepoint 2010 is the ability to create Cascade Lookup columns. This is, to filter the options of a lookup column based on the value of another.
Around the web you can find many solutions, I used one hosted in Codeplex http://spcd.codeplex.com. The documentation needs some tweak, here you might see how I managed to put it to work.
Also, it has a little problem with Chrome, that I solved.
