The 3D graphs are pretty impressive too, so this looks like a good resource since they link to code just to see how they are done. If anybody has any other useful links to these type of galleries (specially with source) please feel free to link.
posted 4 years ago
The R Graphics Gallery is a great place to view possibilities.
The R Graphics Manual allows you to see graph examples from every package in R (roughly 40,000 graphs!).
The blog aggregator R-bloggers has a wide range of graph example, along with the code to create them.
If you already have R installed, you can type demo(graphics), demo(image) , and demo(persp) at the interactive command prompt to view a range of examples.
Finally, "R in Action" includes about 150 graph examples, along with explanations of each. The datasets and sourcecode are available online.