A source for window sticker decoding?
That would be the RPO listing, http://www.camaros.org/options.shtml#RPOSpreadsheet
There's no plans to ever post the ECL data on the web. There's no benefit to the hobby in doing that, none. Don't think for a second that that info would not be used for aged WS recreations. If there's ever a question if a WS is real, just ask. There are several people that can ID a real one (ECL's are only one thing to look at), but the fakes do keep getting better.
Want an example of info gone awry? How about the person who tried to help the hobby by posting known BE axle dates. Best of intentions, but immediately restamped BE axles showed up on ebay....