Do I have a sexual harassment case even though I resigned ?

I resigned from my job as a Loan Officer about a month ago. I had developed a very unique loan program from scratch and once it became successful (after over 3 years) my employer took control of it and basically brushed me aside. Since I left they have been sending me threatening letters that I cannot compete against them although my employment contract does not indicate this. They have also contacted prospective employers and 'scared' them out of hiring me using the non-compete argument that is absolutely not valid. Although prospective employers have read my contract and do not believe that my former company would win in court they still won't hire me because of the expenses of defending a law suit. That is a little background. My question is this: During my 4 years with the company my manager consistently sexually harrassed me with profane comments, inuendos, vulger email jokes, etc... There have been witnesses but I doubt they would testify against him as they still work there. The only 'proof' that I would really have would be pornographic emails that he sent me which I'm sure would still be on the company's hard drive. My concern is that he would claim that my complaint is retaliatory and, in realty, in an indirect way it may be. The fact is that it happened and I was uncomfortable with it. I didn't say anything at the time because I didn't want to face the consequences of possibly losing my job. Do I have a case or am I too late ?