Firewire ports Vs USB ports

I've got an iMac G3, 400 Mhz which has 2 USB and 2 Firewire ports. Now my mouse and keyboard use up the only 2 USB and I wanted to know if any of theses products: mouse,keyboard, printer, memory stick, webcam come with Firewire connectivity? From what I'm able to deduct, Firewire is mostly used for digital products such as camcorders. And If I need to buy a USB hub is there a compatibility issue with this older version of iMac? Can i buy any type of USB huB?

There are FireWire printers, but these tend to be expensive specialized printers, like large format printers. Most consumer printers these days are USB.
There are FireWire flash drives
http://www.kanguru.com/fireflash.html
But they are expensive compared to USB flash drives. There are also FireWire memory card readers, but again, more expensive. In your case, if you really need a high-speed flash drive, you have to get a FireWire flash drive because your iMac USB 1.1 ports are so slow. You can even boot your Mac from it, if it's big enough to hold the OS. For people with USB 2.0, it's much cheaper and almost as fast as FireWire to get a USB flash drive.
I don't know of any FireWire input devices (keyboard, mouse, etc.).
USB hubs are pretty cheap, even the powered ones. This one from Belkin is only about $20 after the $10 rebate (and it has seven ports).
[Belkin Hub on Amazon|http://www.amazon.com/D-Link-DUB-H7-High-Speed-7-Port/dp/B00008VFAF/ref= sr12?ie=UTF8&s=electronics&qid=1217253076&sr=1-2]

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