If you find yourself using files that are in two differen folders or even hard drives, Collections is for you! On the lower left side of the Bridge window you will notice 3 tabs reading Filter, Collections and Export. When you click on Collections you have 2 choices: A straight Collection, or a Smart Collection.
Smart Collections are fantastic because let’s say you buy images from istockphoto.com. The good thing is that the word “istock” is in the name of each image, and if you set up a Smart Collection with Filename Contains istock, Bridge will set up and save that search as a Collection.