Several of the major oil companies have completed the transision to ULSD. depending on your location and the oil company that supplies your area, the sulfur content of your fuel could be a low as 7 PPM to an average of 125 PPM. The transision to ULSD that is mandated by the EPA HAS to occur before the end of the summer and possibly earlier depending on the agreement the oil company has with the EPA.
After August in our area there will be no diesel for sale unless it has been in a tank for some time or it is for off road (railroad) use and that will be over 10PPM.
The ULSD will look like water, there should be no yellow color, there might be a slight bluish tint to the diesel if it is in a clear container. There is a mild odor that is hard to describe. Personally I am looking forward to it.
Just my .02

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Habits I support
95 E300 D 220,000 & counting (I think I'll call him Fritz)
02 Tahoe (Momma's ride)
98 GMC Sierra 120,000
57 Chevy Nomad (bought in '69)