I did a quick search of Expired Sweeps and Sweeps and didn't come up with Simple Green Good News. I was hoping to find the rules, to see if your prize would be sent after a certain date, or other information. Maybe you can find the sweep and get some details, or a way to contact the sponsor, if necessary.
Was it a blog contest or a contest where you had to reply within a given amount of time or lose your prize? If not, maybe it will just show up someday, or maybe someone else has the same name as you??
There are many possibilities. I guess you can either look for the rules, contact the sponsor, or wait and see. GL!