For some reason, I find it harder to find what I'm looking for in the R help than just about any other language. That's why you end up not knowing about useful packages for a very long time. Is that just me?
It's still not perfect, because if you don't know the right keyword for a concept you might not get what you're looking for. But it's pretty good.
[1] http://cran.r-project.org/web/packages/available_packages_by...
You'll get way better results