In my experience in asking about using freestuff in comercial projects i have yet to be turned down or charged money, i think what most folks want is just to know what there stuff is being used for, for example if you had a model that was about to be used in a TV advert wouldn't you like to know....or on the other hand if you created a model that was the main focus in a tv show/ad and the animator was getting LOTS of money and you got zero folks might change there tune LOL........in the end it boils down to respecting the artists wishes and organising your folders to reflect which can be used with what, and/or ASK most are very easy going ;o).....Steve