The SASxport package gives you the ability to directly read, list contents of, and write SAS 'xport' files.  

Features:

• List contents of SAS xport files, including data set names, included variables, variable type and SAS format information via lookup.xport().
• Directly read SAS xport format files, including proper handling of custom formats via read.xport().   (Custom format information can be obtained from a PROC CONTENTS dataset included in the data file or passing as an argument to the function call.)

• Write SAS xport format files, including proper use or generation of custom formats vi write.xport().   (Custom format information can be obtainied from a PROC CONTENTS dataset present in the data to be written or passed as an argument to the function call.)
• Customize translation of R objects to SAS variables by specifying appropriate methods for the toSAS() function.