Shab-E-Barat is not that well known to people as it is mentioned in Hadith rather than Quran. Some people believe more on Quran as Hadith some time might be wrong, as it (Hadith) is a collection of info from different people who so ever heard or saw Prophet Muhammad (sm) performing or saying it.
Pompous bro, Wanna expand on that? I don't have a solid knowledge about this phenomena but just thought to share whatever I knew.
[Edited on 11-10-2003 by ehsan]