i don't think you need to rename the voice files to have "wav" extension anymore. so you don't need this line.
i've tried it the same way with german_male voice and it works without doing this. i just had to start omvoiceserver and set the path to "../german/" folder which contains the "german_male" folder (first i've tried several times to set directly to "german_male" folder which cased the omvoiceserver unexpectedly exiting).

@ Blaizzen
thanks a lot for doing this great job!
one question, i'm still not sure if i have the latest index.html because there're different versions available. does the first post have the latest version attached or could you update the archives there please (i'm a new onwer of a n900 and it take some time to read through a full thread like this )?
and how do i search for save POIs and get those into the map. i've saved 2 adresses as xml (with the last search option in omvoiceserver). but i can't get them show up in my map (tried to search with "use online serach" off).

cheers
jens