If your source is true 16:9, and your product is going to tape, AND your customer uses 4:3, you can put a reformat FX (found in the effects pallette under reformat) on a top layer of your sequence (I’d duplicate the sequence first and work off the copy).
If you are delivering via MPEG, and your customer uses 16:9, make sure you check your export options and the 16:9 button is checked. I use Sorenson, and you can tell it to keep it in 16:9 (a .wmv will play a 16:9 video just fine). You’ll probably need to do a video mixdown to get the sequence to export.
Bottom line – if your 16:9 sequence is going to 4:3, put a reformat on it.
Jon
“The Almighty tells me He can get me out of this mess. But He’s pretty sure you’re F%$#*D!”