Add my vote for filters. Even adding a one letter flag to the already unwieldy filenames wouldn't make them much worse and would make it easier to categorize stuff after the fact.

Even with them though, people are pointing out that it isn't as simple as yes/no. My thought is that anything that makes money falls under commercial - better safe than sorry. So even if its a dress on a figure in a promo for a car model, if you're selling the car, it counts. That dress is part of the overall effort to make money. If it's of no significance, use another one. If you like it enough to reeealy want to use it then you'll have to pony up. If you use a render on a commercial web page or a graphic on a program you sell etc., it's commercial. Yeah, that may seem overbroad in cases but it covers the fact that when money starts being made, people are more likely to become more proprietary shall we say. Start from that premise and any surprises will more likely be pleasant ones.

I have no idea of ever making a penny on my puerile pixelations, but who knows. I certainly wouldn't maintain Kosher and non-Kosher downloads based on the slim prospect though. Again, how many people are going to download only CUA (Commercial Use Allowed) items or segregate downloads unless they're pretty sure they will sell stuff - maybe more than I think. Unless you plan to sell something, why would you limit your images to CUA content? If you don't then when someone suggest selling that image, then you still may have used non-CUA content in it. I suppose it's a good idea, just in case, just like it's a good idea to do a lot of stuff up front that people don't do because they don't think they will ever need it :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken