The next version of the googleVis package has been released on the project site and CRAN.
This version provides updates to the package vignette and a new example for the gvisMerge function. The new sections of the vignette have been featured on this blog in more detail earlier:
Using googleVis with knitr (Link to post)
Using Rook with googleVis (Link to post)
Using Reduce with gvisMerge to display several charts on a page (Link to post)