Keep the printer on your Windows and do the following on your Mac:

1. Open the Terminal program
2. Type "cd /usr/libexec/cups/backend"
3. Type "sudo ln -s /usr/bin/smbspool smb" and type your password when prompted.
4. Type "sudo killall -HUP cupsd"
5. Close Terminal, and open Print Center
6. Hold the Option key, and click Add
7. Select Advanced, then Windows Printer via SAMBA
8. Name the printer in Device Name
9. For Device URI, type smb://192.168.0.10/printername/ (Change the 192.168.0.10 to the IP of your Windows 2000 machine)
10. Select the Printer Model and Name, then click Add

Second solution is to upgrade to Panther this Friday, it has Windows Printing enabled out of the box, and even supports browsing the network to see the printer.