Rstudios shiny package is a great way to build an Application for interactive visualizations out of R.
For our example App we recreated Hans Rosslings (Gapminder) Visualization which puts a countries Life-Expectancy in relation with its Gross-Domestic-Product.
We used the data from datamarket.com via the rdatamarket Package. We combined data from Gapminder(Population), the World Bank (GDP) and from the United Nations (Life-Expectancy) with each other. Datamarket.com even offers an R-console snippet for importing the data directly into R (Under Export).
The following lines of code shows what you need to do. Have fun with R in the web.