Yes, you can do curb side check in with Jet Blue.
Right after 9/11 they were telling us three hours in advance for security checks. Not so, we were waiting at the airport for all eternity. You prob. only need to get there an hour and a half in advance, just to be safe.
I flew Jet Blue from JFK to Ft. Lauderdale (I think, lol) in Feb. It was fine, the only time I had a problem with security was in Florida, I had to take off my shoes and they took my bag apart.
Good choice with Jet Blue though. I had such a great experience on this airline. The seats were comfy, all the planes are new, the TVs are great! and the employees were cheerful and very helpful.