The current version is dataframe_2.7.1.tar.gz. This is for R 2.15.1 - 2.15.3. It includes changes made through R 2.15.3. This will not work with R 3.0.
This will not go on CRAN. New CRAN policies prohibit .Call calls to routines internal to R; these are present in some of the standard dataframe code.
An older version is below, dataframe_2.5.tar.gz. This is suitable for R 2.15.0. It can be used with earlier versions if you create paste0, like paste but default sep="", then edit DESCRIPTION
to remove the dependence on R 2.15.0.
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The file memory.R (see below) has some benchmarks, including R 3.0.0 (without the dataframe package). R 3.0.0 does more large memory allocations than previous versions. They are not copies of the data. Some people from r-devel are looking into this.
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Current version aggregate_22.214.171.124.tar.gz