VNR's are a quagmure for stations. If your VNR gets used, they will run it with a disclaimer or "video provided by" key during the entire VNR. They, most likely will not run it as you produced it. Remember, its a Video News Release. This means they will cut it to fit their needs, and what even more likely is that it will be used for VO. As far as dristubition, thumb drives are a better option than DVD's, but have you thought about sending out a downloadable link? You can give more format/choice options for downloading. HD, SD, .mov, .mfx, h.264, ProRes, etc. Make it easy for them. One big advantage to having them download your file, is you will know who downloaded which file and that may help when you need to provide usage analytics.