From the comments on this post: http://aralbalkan.com/1381/
$ svn cat -r [rev] [filename] > [workingcopy filename]
for example:
$ svn cat -r 17450 build.xml > build.xml

From the comments on this post: http://aralbalkan.com/1381/
$ svn cat -r [rev] [filename] > [workingcopy filename]
for example:
$ svn cat -r 17450 build.xml > build.xml