Biggerpockets.com is one of the best websites/forums for real estate investors. While NYC is a not the norm for the site, you can pick up great info whether you are a buy and hold, flipper or wholesaler. The weekly podcasts are a must listen. The best feature to me is the forum where you can post a question and get answers from other investors all over the country. I have listened to the podcasts for about 6 months and just joined the forums. It is truly a great online community.