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Here's the video of his play: http://seattle.mariners.mlb.com/media/video.jsp?content_id=6705769
Here's the article in which mlb.com manages to state "they still see him as a 3b" about four times in five paragraphs: http://seattle.mariners.mlb.com/news/article.jsp?ymd=20090917&content_id...
Regardless, the fact that this is not just a AAA experiment, but they are actually sticking him there in MLB games, is just another amazing move by Jack & posse.
It also strengthens my view that they will view Lopez as a Putz-like trade chip (impressive stats, bad fit for what they're trying to accomplish), but that's probably just me over-interpreting.