A couple of thoughts based on what I see in this thread:

Generally, you can not be terminated with cause if the employer has not coached or documented your non-performance over a period of time. If the employer lets you go with a severance package or the language of laying you off, you are entitled to unemployment. If you feel that the separation was trumped up, file for unemployment. Heck, even if they say it's for cause, file for it, because often the employer will just pay the unemployment because it's easier than proving cause.