The third round in my list of favorite resources, this one is mostly not NYC centric, but the internet is everywhere, even here in New York.
See my previous lists of Venues, and Community

If you've got a favorite resource I should add then please let DPI know.

Materials for the Arts
33-00 Northern Boulevard, 3rd Floor L.I.C.
http://www.mfta.org

Build It Green
3-17 26th Ave Astoria
http://www.bignyc.org

Isadora Forum
http://forum.troikatronix.com

GRL (graffiti research lab)
http://graffitiresearchlab.com

Markertek
http://www.markertek.com

B&H Photo
http://www.bhphotovideo.com

SparkFun
http://www.sparkfun.com

RentFusion
http://www.rentfusion.com

Projector Central
http://www.projectorcentral.com

Cycling74
http://www.cycling74.com

New York Media Arts Map
http://nymediaartsmap.org/