<p>just wondering if anyone knows of a truly restful Put/delete implementation asp.net mvc preview 5 preferably.</p>

I don't know of one off the top of my head, but you might look into the way that Rails handles it if you don't find anything else, and try porting it over. Rails utilizes POST, GET, PUT, and DELETE, but it apparently has to do some fakery for PUT. Could be worth looking into if you come up dry here.