In a guest post here on February 20, Tammer Kamel introduced us to Quandl, a kind of "wikipedia" of time series data. In the post, Tammer (the founder of Quandl) noted that they were working on an R package to give R users access to Quandl as a data source.
That package is now available. It includes the Quandl function, which R users can give a time series identifier, a start date and and end date and get an R time series object for plotting or data analysis. Since all data on Quandl is free and open, R users can use this function to access and use time series data without restriction. Enjoy!
Quandl: R Package