USB Flash Tools made by Sarah Dean is a straightforward toolkit which provides various functions for use primarily with all flash memory card (e.g. SD cards, Compact Flash cards), and is equally at home working with USB flash drives (aka key drives, pen drives, memory drives, flash drives, key sticks, etc)

USBDLM (USB Drive Letter Manager) is a Windows service that gives control over Window's drive letter assignment for USB drives. Running as service makes it independent of the logged on user's privileges, so there is no need to give the users the privilege to change drive letters. It automatically solves conflicts between USB drives and network or subst drives of the currently logged on user. Furthermore you can define new default letters for USB drives and much more.