The year 2007 may prove to be one of the most important years in the storied history of New York City's development. In a future timeline of urban advances, it might be printed in as big a font and as bold a type as 1811--when the grid system was adopted--or 1904--when the I.R.T. subway opened. The text adjacent to 2007 could say something like "the start of livable streets," or "the bike boom begins," or "congestion pricing kicks off." It may turn out that all of those descriptions may suit 2007. The real question is, in hindsight, will they?