I do not know about a good R-package for this. There are some features, such as cloud in the snippets package, and possibly other features, but nothing compared to http://wordle.net , http://tagcrowd.com/ or Many Eyes . Drew Conway did some nice things with tm + ggplot2 ; I also played with it a while ago, but it was more for playing with a cloud of 3D tags (with rgl ) than wordle.

There are some ongoing projects in Python or Processing that are described in detail in this question . As far as I know, Tagxedo looks great, but it does not have an API, and it relies on Silverlight.
Pierre Lindenbaum also has some Java code, see his blog post Game with Wordle Algorithm: Mesh Condition Tag Cloud .
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