Where?

http://cran.r-project.org/web/packages/rredis/index.html.
Find the development code here: http://github.com/bwlewis/rredis/.
Find R here: http://www.r-project.org.
Find Redis here: http://wiki.github.com/antirez/redis/.

What?

A native Redis client for the R language (an R package).

Why?

Redis is a key-value database that can be very useful to many R applications. It implements fifo-like queue objects, set-based operations, it runs over TCP/IP and it's really fast.

Doc

http://cran.r-project.org/web/packages/rredis/rredis.pdf

Introductory Vignette

http://cran.r-project.org/web/packages/rredis/vignettes/rredis.pdf