Jpeg's definitely have their advantages. I recently almost went back to shooting them, simply because I got sick of having to edit a ton of photos from sports games. If I shot them in Jpeg, I could have saved myself a ton of editing time. My solution was to make a bunch of presets in LR3 for different sports/situations, to make batch editing easier.
I will never use a .jpg file to make my final product (unless it's a family function or such), however, I will be using them soon, to shoot to an eye-fi card in the second card slot on my D7k (when I get it) so they can transfer out to my ipad, and upload directly to a hidden gallery on my smugmug. This is for a few reasons, one, to have a bigger screen to review photos on, or show to clients, and 2, as an automatic off site backup (albeit in .jpg, so it's a last resort). I'd do it with RAW files, however they take longer to transfer.