Cost Effective and Convenient
I would strongly recommend that anyone travelling to New York seriously consider buying a City Pass. Quite apart from the saving (the total cost of going to all the sights in the Sights booklet exceeds the individual entrance costs significantly), there is the convenience of not having to queue for ages at popular sights. Most of the sights have special queues for people with the CIty Pass. I found it a very cost effective and convenient way to see New York's most important sights.
Review of New York CityPASS by CM Girvin