I have just received an iPad as a Christmas present from my beloved husband. And there is a question I have already raised concerns about, that is the compatibility of R with the iOS devices. It is proven that R language is successfully compiled by the iPhone development tools, unfortunately, according to the Apple's Terms of Service, no GPL software can be acquired through the App Store. Hereby, either we have to wait till Apple modifies its TOS, or - jailbreak our iPad/iPhone. Then there is a completely described procedure of installing R on the iOS (jailbroken) devices.
Meanwhile, a web interface for R can be used since the access to internet is available: the RWeb compiles the R code once entered in a text box and returns the output on an html-page. Although the process goes a little slow, we cannot but consider the fact the plotting options are also available (as well as the year of creation of the service: 1998!)
As for Apple App Store, the only "R application" available by now is the R-Chart, the news service of the R language programming community.
However, we hope Apple would reconsider its decision over the R client for its iOS devices - due to the high and spreading demand both on R and mobility.
I personally would be very glad to receive any comments, corrections, news, updates, and hints. Happy holidays everyone!