You dont need ovi suite or nokia pc suite.

On the phone connect - hit "pc suite" mode and on the pc you'll have a "usb0" interface created. Set up the IP addresses at each end, and routing, install the kernel-maemo kernel and iptables (for NAT) and bingo - job done. There are plenty hints around - search for "usb0" "NAT" "tether" or "tethering"