R interfaces with the powerful Google Visualization API with the package googleVis (see here). It's relatively easy to convert your graphics in R to interactive graphics to post on a web browser. And the graphics are quite nice, as seen below in a simple graph of some of my data collected from this summer on seed predation to Helianthus annuus seeds in Texas:
Data: data2, Chart ID: MotionChart_2011-01-08-19-31-57
R version 2.12.1 (2010-12-16),
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