Online R documentation

...
Such a website exists:

http://finzi.psych.upenn.edu

Right near the top is a set of links to (almost) all package
documentation.  Duncan Murdoch helped here by including an option to
build static pages in the R source.

There is also a search engine.

   

It's not the first time I've said it, but Jonathan Baron's search engine 
has always provided answers when my local R help can't. The only change 
I would make is to default to searching R functions only. If I had a 
more gutsy server myself, I would offer an Australian mirror.

Jim