I'm not really sure how much work's been done on my favorite supposedly non-dinosaurian dinosauriform, but Dzik & Sulej (2007) suggest that initial reports (Dzik 2003) placed it just outside of the Dinosauria proper, but the new paper briefly describes new material and suggests that Silesaurus is the most basal ornithischian known. This is a position I generally agree with--the original ornithischian is not going to look like Lesothosaurus. It's going to look more like Eoraptor or Herrerasaurus, because those two dinosaurs retain more plesiomorphic features, whereas Lesothosaurus is more specialized than either. Does anyone out there have strong opinions either way? Seems like you could get a lot of descriptive text out of Silesaurus, but aside from these two papers, I haven't seen much.
Also, how do you pronounce the name? It seems like there are a lot of possibilities. It's always said "SIGH-ul-SORE-us."
Dzik, J. (2003). A beaked herbivorous archosaur with dinosaur affinities from the early Late Triassic of Poland. JVP 23: 556-574.
Dzik, J. & Sulej, T. (2007). A review of the early Late Triassic Krasiejow biota from Silesia, Poland. Palaeontologica Polonica 64.