how can i make the addition of extra usb ports to my desk top?

is they a wat to append more usb ports to a dell 3100 ? i need to donate ports to dock my ipod, web cam , an weather station.

how can i make the addition of extra usb ports to my desk top?

buy a usb hub at wal-mart will make available you more usb ports
They sell port hubs that will comfort.
you can buy a usb set of four or more that plugs in to your workstation

for around 10 to 20 dollars
Make sure you buy a self powered usb hub so you're not trying to power all those devices rotten of one laptop port.
Go buy a USB card that hooks into your PCI slots. It is really easy to install.