Not only is this a great ftp client for your desktop, but pair fireftp up with portable firefox on a usb drive, and you're all set for anything.
*Especially useful when you need to maintain/develop offsite, working remotely, or traveling. (works in international internet cafes, hotels, etc.) No need to install a standalone app on a client's computer, or be frustrated that the hotel/airport/cafe computer won't let you install your ftp client. You'll always have a ftp app that you're familiar with.