You can try these websites. Some of the downloads are free and some are charged. You can also call your local Siemens representative and he/she will provide a free demo that includes WinCC 6.0 on it but only for 32 tags. That is all you will need to run the demo.
Another invaluable resource that may be able to email you some examples is www.iquestcorp.com Since they are a Systems Integrator, they may want to talk to you about consulting work if you need it.