I just got tethering to work with openSUSE 11.0 using a Sprint Touch upgraded to WM6.1. It was very, very easy. Here are the steps that I used:
Ensure that development packages are installed. I usually select Patterns->Kernel Development and in this way get all of the development tools plus the kernel sources (handy if it is necessary to compile one's own modules).
su -
cd /usr/src
svn co http://synce.svn.sourceforge.net/svn...usb-rndis-lite
cd usb-rndis-lite
make
./clean.sh
make install
On the touch start the communications manager, select "USB" as the PC connection, and then click on "Connect". Plugin the touch via the USB cable to your PC and voila! NetworkManager will be informed of the new device and make the connection.
My thanks to FordWrench for the post about the usb-rndis-lite build which made this possible.