Since slices allow us to optimize to a set file size, we use sliced artboards at work to quickly create/export jpegs for the Google Display Network and for our sites. We've made the process pretty seamless with solid templates, but the only thing we haven't figured out how to do is rename the slices. The default is FileNameSliceNumber, but that slice number doesn't help us see the dimensions at a glance. If in our template we could rename slice "04" to "728x90" or whatever custom descriptor was necessary, we wouldn't need to manually change the slice name when delivering assets to vendors and clients.