The realistic hope was never September 08, but was that GRRM would finish the manuscript by the end of June to turn into his editors in hopes for a November 08 release.
As GRRM has noted on his blog - that didn't happen. So I would think right now the earliest we will be seeing ADWD will be spring 2009 - and probably later than that, given his past performance.
It is very frustrating as a fan of the series to have to wait so long for the books, I know.
It is what it is.