As I recently wrote, we applied for using the WordPress Plugin Repository, which provides a subversion repository free of charge.
The LinkLaunder plugin has now been approved and it can be accessed here: http://wordpress.org/extend/plugins/linklaunder-seo-plugin/.
Please note, that this is version 0.85 and is by far not ready for public release. We are getting very close, but several features have yet to be implemented, so try it at your own peril. Don’t say we did not warn you!