bwnbwn - 8:14 pm on Jul 6, 2009 (gmt 0)

Marta unless it is a absolute must I would not change a thing. Old Texas saying "If it ain't broke why fix it"

Yes if you changed your prefex ending you would MOST likely suffer some ranking problems and then it might be a crap shoot if all of them come back or not.

Then you will have to 301 every page to the exact url in the new prefex.