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Here are web resources that provide information about phenology, both ground-based and via remote sensing:

National Phenology Network 

Project Budburst 

Phenology - Wikipedia  

Measuring Vegetation (NDVI & EVI) MeasuringVegetation/ 

University of Montana Numerical Terradynamic Simulation Group 

Boston University Climate and Vegetation Research Group 

The Vegetation Index and Phenology (VIP) Lab 

MODIS for the North American Carbon Program (NACP) 

MODIS Land Products Subsets 

Ameriflux Network 

Global Geo-Referenced Field Photo Library