R help - May 2006 - cluster benchmark datasets

R Users

I'm working on a project where i need to test the accuracy of all
clustering methods available in R. I was searching for some benchmark
datasets to compare the results but couldn't find any sets where the
clusters are represented along with the data.

does anyone know if there is something in R what i can use ?
or maybe other locations where these datasets are hosted ?

Thanks in advance

Richard Mendes