Hoi, I have just posted the methodology of handling alternate ways of writing in Wiktionary on Meta http://meta.wikimedia.org/wiki/Alternate_writing_in_Wiktionary. This method is, as used on the nl:wiktionary and it follows a previous post on this mailing list where I asked for comments on this subject.
This method handles both the descriptions of alternate spellings (colour vs color) as alternate spellings and the different usage of charactersets (eg simplified and traditional Chinese)..
As always I am happy to receive your comments as these allow for the improvement of the methodology. One recent change implemented for instance is the use of categories to indicate words in a language. As almost all words have been touched by a database change recently, the categories that are populated from the language templates, will show their content. (Currently there are 375 Dutch words and 185 English words on a total of 5414 articles). 125 more to go to reach the 500 mark for Dutch words :)
Thanks, GerardM