This is cross-posted from Tony's blog onthelambda.com Version 2.0 of my data set validation package assertr hit CRAN just this weekend. It has some pretty great improvements over version 1. For those new to the package, what follows is a short and new introduction. For those who are already using assertr, the text below will point out the improvements.
I can (and have) go on and on about the treachery of messy/bad datasets.