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I noticed when using your plugin that plenty of characters where missed and the worst part was that the chars where "translated" only once and ignored after that in future inputs (not even replaced by a dash).
Example 1
Example 2
I guess that the plugin is now optimal for west european languages.
The refactored code is adapted from "jQuery Slugify a string!" from Pablo Bandin
http://tracehello.wordpress.com/2011/06/15/jquery-real-slugify-plugin/ (Dual licensed MIT / GPL)