One feature I especially like since the Facebook redesign is the ability to group your "Friends" list. If you have not noticed this feature yet, start by going to your "Friends" list. On the left side, click "Make a New List." Just as the instructions say, choose a name for your list, then hit the Enter key to save the name. You will be given a screen where you can type names or, even better, you can select multiple friends from a list of your entire Friends list.
Additionally, this feature allows you to do two other things I find helpful: 1) You can send a message to an entire group of friends and 2) You can select your group from the "Live Feed" on the dashboard. This allows you to get a quick update of information for a select group of people.