Just hit
http://www.celiocorp.com/install from either your PC?s or phone?s browser.
If you go there from a PC you can download an .exe to sync over to the phone.
If you go to that link from your phone, you can download a .cab over-the-air that self-installs the driver.
Personally, I like the over-the-air method.
Make sure to check to see if your REDFLY has the latest firmware ? hold down both the ?fn? and REDFLY logo keys on your device at the same time and it will pop up a window. Under, ?FW Version? if it doesn?t say 1.3.29 or later you need to update it. The same links above will allow you to download the firmware updater.
BTW, thanks waldo15 for sticking up for us in the comments on that Engadget post today. You rock!