I don’t know how many of you would need something like this, but it’s pretty cool anyway: USB Drive Letter Manager is a free download for Windows that lets you perform all kinds of neat tricks with USB devices in Windows. The primary feature of USBDLM is that it can assign a given range of letters to your USB mass-storage devices. You can also have USBDLM not assign a drive letter to a multi-format card reader until a card is actually inserted into the drive (most of these types of drives assign 4 drive letters when installed in Windows; USBDLM can assign a specific range of drive letters, plus only assign a letter when a CF or SD card is inserted, for example). And one of USBDLM’s coolest features allows you to assign drive letters to specific USB ports – so you can set it up to always give devices attached to the top USB port on the front of your computer the letter R:, for instance.
USB Drive Letter Manager is freeware and works with Windows 2000, XP, 2003, and Vista. You will probably need to read up on the instructions a bit, as everything is controlled through a single INI file. I’ve used it for some time now, and I just think it’s great!
Read more about it here.