R help - Nov 2013 - Reverse geocoding Latitude and Longitude to address/name of location

I have a data frame with the column for latitude and another column for
longitude. I would like to create a reverse geocoding function that creates
another column with the address corresponding to this lat and lon

 i.e

 lat             lon                  address
41.4938     -81.9860             ???

The second thing I am trying to do is to use the lat and lon or the
generated address to find the name of the location corresponding to the
lat/lon. The lat's and long I have are all for store/fast food locations
like MacDonald/Burgerking/Subways.

 lat             lon                  address     store_name
41.4938     -81.9860             ???                 ???

In general I am trying to automate and execute the following using R
1) address associated with a particular lat and lon
2) store name associated with the lat and lon/address

 Please let me know if there is anyone who knows how to do item 1 and/or 2
in R or if there is a function that can do this in another language.

Thanks
Vijay

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