Digital cameras and PDAs come with a wide assortment of memory cards. Hooking up these devices via a USB cable and possibly having to install software can be a real bother. This device from Buffalo allows you to directly insert into your computer any memory card likely to come your way. Any card that can behave as a hard drive -- and most of them can -- will simply appear as another drive letter.
This is potentially a huge time saver and it does not cost very much. By the way, many newer computers offer these drives as add-on options. Well worth the few extra bucks if memory cards are in your environment.
Buffalo's "28-in-1" card reader - Engadget