This Panasonic Toughbook has 3 USB ports.
The Atom N270 laptop has three USB 2.0 ports.
Most motherboards come with at least six USB ports..
only 2 usb ports on the front
There is no minimum or required number for USB ports on a laptop. Depending on the age and design of the laptop, it could be anywhere from zero to ten. I have seen only 2 USB ports on older laptops, most of the new ones atleast have 4 USB ports. Netbooks(10" & 11") have not more than 2 USB ports. If in anycase you need more USB ports, you could buy an USB hub for as less as 10$, which will add 4 more ports to your laptop.
In regards to the average usb port hub and how many ports are available, this can vary. The average usb port hub can support up to four usb inputs at a time.
2 usb ports. http://images.techtree.com/ttimages/story/105648_ps3-450.jpg
usb 2.0 can support 127 devices
iPads do have usb ports. You just have to buy an adapter
Windows xp will support 127 usb ports
Who told you it had no USB ports? Of course it has USB ports. The iMac has 4 USB ports, 1 Firewire port, 1 Thunderbolt port (2 on the 27" iMac), 1 Ethernet port.
3, 4, 5, 6 it depends on which one you buy. There is really no limit to the number of ports.
The Sony VAIO VGN-NS130E/S, comes with 4 high speed USB ports, and 2 memory slots.