It is case sensitive as are most UNIX based packages, so A and a are different symbols and would refer to different variables. The set of symbols which can be used in R names depends on the operating system and country within which R is being run (technically on the locale in use).
All of R's programming libraries are free, but Revolution Analytics makes its business from its service packages, which give customers access to the libraries the company develops in-house.
RStudio is an integrated development environment (IDE) for R which works with the standard version of R available from CRAN. RStudio includes a wide range of productivity enhancing features and runs on all major platforms.
Use the help() command.
http://rseek.org is a great search engine for R manuals, mailing lists, and various websites. It's a Google syndicated search app with specialized UI. I always use it.
An update, several years later
All the links you need are right here:
https://stackoverflow.com/tags/r/info
This was discussed on the R-Help mailing list recently.
Some things mentioned there that haven't been covered here are:
Using the RSiteSearch function, and the package of the same name.
Using R-specific search engines. You mentioned RSeek and RSearch. You can also search the R mail archive, the help wiki, the task views, RForge, and Bioconductor among other places.
Most of the time I find googling for R plus my searching term works fine. When it doesn't, I'll try using "R project", or adding CRAN, statistic or language to the search.
Is there a particular topic that you're having problems searching for?
A new CRAN package is extremely helpful for this: check out the "sos" package.
I would just add, one great way to search for R script is to type your search term into google with "ext:r" at the end. This will return all files that have the R extension. For instance:
I usually do my basic R searches with "r-project" at the beginning, since most people who refer to R in any great detail will usually also reference the site.
Joining this discussion very late, but here is my preferred search string in Google: [R] followed by search string.
For example:
[R] lm
finds several links to linear modelling in R
The reason this works is that StackOverflow uses the [r] tag, and the R mailing lists also use [R].
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