Quite a few comments in forums regarding the drop in indexing/ranking when adding the site maps protocol.. This used to be a google sitemaps topic and now has moved to yahoo, however tim (assuming Tim Mayer)Â has commented on SERT the following
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This is simply not true.
Tim
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 Last month Google, Microsoft & Yahoo! Back SiteMaps Protocol, so it makes sense to begin converting your sitemaps to one standardized file. One such webmaster did that, submitted the new file to Yahoo! and claimed that Yahoo!’s Site Explorer dropped half of his pages from the index.
Read the entire blog here:
http://www.seroundtable.com/archives/006856.html
