http://www.edmunds.com/bmw/m3/2010/review.html
This is preaching to the converted in my case, but I posted it anyway. The new Edmunds review of the 2010 BMW M3 - changes from my 2009 are so small as to be insignificant totally. It is the same car exactly.
Too much fun.... 
Ovr...nice try. I know you (and me too for that matter) want very much to believe that there are so few changes that the value has not changed at all. Now let's listen to the Salesman's story - I'll bet it has.....according to him. He/she will be full of reasons why the new one is sooooo much better. 
And then there is that little issue called depreciation....and abuse, well yours anyway! 
Just kidding, guy. Just kidding.
Inco - you are obviously correct regarding dep'n, the bane of all car owners..
. And, of course, the more expensive the car, the bigger the hit - such is life.
The local shop doesn't often stock M3s (or M5s) for inventory. They do sometimes order in an M6 which tends to sell to the more status-encumbered buyers (whereas, IMO at least, the M3 and M5 appeal more to true enthusiasts). Thus, (at least at the local dealers), the model roll over into 2010 vehicles is free of any 2009 M inventory cars. At other dealerships, who knows what the sales dudes say, but I would doubt they would fool many M car buyers. The next major slated change for the M3 is not until the 2012 MY, probably to come mid 2011, and the M3 will NOT have the present V8 engine. It will likely be a turboed 6. The V8 M3 will have existed only for MYs 2008 to 2011. EDIT - It appears that the current M3 will exist until about MY 2013, then to be replaced with a tt'ed 6 cylinder.
I think the X5M and X6M will become more popular, notwithstanding their rarified pricing. There are many M car owners who think these 2 SUVs in M form are a travesty of the M nameplate. And I see their point. The local dealer just sold a black X6M last week. I saw it there when getting my winter wheels/tires put on.
