WebJunction has a list of the Top 5 Emerging Technologies for Small Libraries.
1. Flash and USB drives
2. Wireless Access
3. Thin Clients
4. Upgrading Operating Sytems
5. Technology Planning

As I said in one of a blog a while ago, the floppy is going the way of the dodo bird. Get on the flash and usb drive train before you are left at that station. When replacement time comes, make sure your new computers have usb ports on the front, it will make life easier for you and your flash drive users.

I can only dream of wireless access here at my library. However, I am in a hospital library and our wireless is locked down like State Secrets. Rightfully so, you can't have unsecure network access in a facility that has tons of patient data.

Thin Clients: I can only speak from what I see of our patrons. It is ture, patrons want everything (all applications and storage) to be at one centralized server so that they can access it whenever wherever they want. They want the computer in the library to have the same stuff and access as the computer on the desk in their office. We are close but not their yet. Again that comes to an issue of network security in an hospital environment. However, it is slowly happening.

Upgrading Operating Systems and Technology Planning should be no brainers, but many places are afraid to get a new operating system due to the up front costs, but the time and money you will save on service calls and trouble shooting will eventually cost you more than the operating system. You can take some of the bite out of the upgrading of your operating systems or hardware by planning for your technology.