I had posed the same question last week and was advised to keep checking the IRS web site.

In one place on the BMWUSA web site it still states(or did three weeks ago) $1800
credit.

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Current - 2010 X5 35d
Retired - 2008 X5 3.0
Retired - 2007 X5 3.0
Retired - 2006 325 3.0