[paddington]

You set the PORT -> IP mapping lines in your router.

You only need the single port for each uTorrent client (so, 2 in your case), so you'd 1001 to IP (computer) #1, then 1002 to IP (computer) #2.

To get each computer's ip address, do this (on each one):

START>RUN
CMD <enter>

this gives you the black command window. type:
IPCONFIG /ALL <enter>

and you should get this

 C:\Documents and Settings\James>ipconfig /all
Windows IP Configuration
		Host Name . . . . . . . . . . . . : xxxxxxxxxx
		Primary Dns Suffix . . . . . . . :
		Node Type . . . . . . . . . . . . : Unknown
		IP Routing Enabled. . . . . . . . : No
		WINS Proxy Enabled. . . . . . . . : No
		DNS Suffix Search List. . . . . . : xxxxxxxxxxxxxxxx
Ethernet adapter 10-100-1000 RJ45 NIC:
		Connection-specific DNS Suffix . : xxxxxxxxxxxxxxxxx
		Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connect
ion
		Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
		Dhcp Enabled. . . . . . . . . . . : Yes
		Autoconfiguration Enabled . . . . : Yes
		IP Address. . . . . . . . . . . . : 192.168.10.xxx
		Subnet Mask . . . . . . . . . . . : 255.255.255.0
		Default Gateway . . . . . . . . . : 192.168.10.xxx
		DHCP Server . . . . . . . . . . . : 192.168.10.xxx
		DNS Servers . . . . . . . . . . . : xx.xx.xx.xx
											xx.xx.xx.xx
											xx.xx.xx.xx
		Lease Obtained. . . . . . . . . . : Wed - 28 Nov 11:51:52 AM
		Lease Expires . . . . . . . . . . : Thu - 29 Nov 11:51:52 AM
C:\Documents and Settings\James>

Your machine's current IP ADDRESS is what is labeled in BOLD above. Use that when mapping your ports to each machine - set uTorrent to match and you should be all set!