A friend of mine wrote this article about Prop 8 that might give some cause for hope. Here's the link:
http://www.oasisjournals.com/2008/11/legal-groups-file-lawsuit-challenging-proposition-8-should-it-pass
Though there is obviously sufficient precedent for striking down amendments like Prop 8, a lot depends on the politics of the judges on the court, and I don't really know anything about the makeup of the California Supreme Court. I guess we'll all know soon enough.
These kinds of cases are the reason we all need to support The Human Rights Campaign (www.hrc.org), The Lambda Legal Defense Fund (http://www.lambdalegal.org/) and other advocacy organizations. For Heaven's sake, give your money to them, not to the politicians. You can't trust any of those bastards on gay rights. The wheels of the campaign busses on both sides are still sticky from all the GLBT people that got thrown under them during this election season.