SDLV is not an actual vehicle but a concept, which has been around for a long time, sense the 80's. Shuttle-C should be merge because it was one of the original concepts. Ares on the other hand is a launch vehicle that uses shuttle derived hardware.
I removed this as 20 mins of googling revealed no supporting evidence to the claims made, and there was no supporting link. I will admit that the SRB exhaust is rather unpleasant and a liquid fuel system would be preferable (although using LH2 would not, as the structural penalties are to high)
Why do they want to use 5 ssme's instead of fewer more powerful Delta IV engines? Wouldn't they be better, since they are in series production and were designed for simplicity and robustness (low cost as a consequence)? Plus, fewer engines increase reliability and if they used four, the booster would be more powerful. Do they have a huge stockpile of ssme's? - Unsigned by 172.193.202.182
It says at the top of the article that "no official announcement has been made" but on NASA's webpage it looks like there's no question that they're going to persue the Shuttle Derived Launch Vehicles.
Is this sentence necessary in the article? The rocket looks like a lengthened space shuttle boost system, without the space shuttle attached (perhaps this is why it is called "shuttle derived"), is Robert Zubrin credited with that design?
Apart from looking very similar, here are the specific links between Ares and SDLV. Bear in mind that the Ares concept is several yearss older than this SDLV version, and that NASA most definitely were at least aware of Zubrin's concept before SDLV was drafted: