should be no risk involved. make sure you cash the money order before you send the items (could do this in the same transaction at the post office even)
i've done some sketchy internet deals with people i probably shouldn't trust and i've bene lucky thus far. i've only had one problem with intentional fraud...little did the kid know that I would be in florida (from NY) within that week. he almost cried when i showed up with 3 or 4 of my friends asking where my money was (he had sent me an empty ipod box...instead of the ipod). he paid up, and thensome haha.
money orders are pretty safe, but i'd still wait to have the cash in hand before shipping the item