g1smd - 7:39 am on Jun 28, 2011 (gmt 0) [edited by: g1smd at 8:12 am (utc) on Jun 28, 2011]
Once the product comes back into stock, you may have a problem if Google SERPs continue to say that it isn't - either in the displayed title or in the snippet.
So you'll have to find a way to keep those words out of the SERPs title and snippet - but then you risk a high bounce rate for those pages while the product is out of stock.
Maybe you could manage expectations by putting an "expected back in stock by <date>" message instead and hope that appears in the SERPs. I would probably visit a page where the SERPs indicates "expected back in stock <last week>".
[edited by: g1smd at 8:12 am (utc) on Jun 28, 2011]