The new package R2MLwiN package bridges R and MLwinN software for multilevel analysis. From the examples provided, it looks very promising. It will be great if a command line version of MLwiN can be made available under Linux so the package can be useful to everybody. Also, it will be great if a similar package for Mplus can be developed in the future.
There is also a Stata package that connects MLwiN with Stata. A quick glance suggests that the two packages have similar functions.