Honda sells more Accord hybrids than people here seem to think. Total Honda hybrid sales (Civic, Accord, Insight) for 2005 were 43,358. See:
http://www.thecarconnection.com/Auto...175.A9879.html
We can assume some increase in 2006 to perhaps 50,000. So the tax credit should be safe through 2006. It might be reduced to 50% by the second or third quarter of 2007. That's my guess.
It'll be interesting to see how Prius and HCH sales are affected in the fourth quarter of 2006 when the credit for the Prius begins phasing out and the HCH still has the full credit.