Nice image, Olivier! I've been following all the posts on the X10 with some interest, and have just taken the bait and ordered one, which should arrive early next week. It's for those times when I want to carry something a bit more portable than my D300. I'm expecting (largely from the comments I've read in this forum) that I won't be disappointed with the camera's handling, nor with the image quality.
Regarding your 6mp photo, I have a D50 and have been very satisfied with the image quality it produces. I've printed as large as 20"x30" from 6mp and gotten very good results. I know that partly depends on the subject you're shooting, but still, I've been amazed at what a large 6mp photo can look like, and despite higher mp counts feel (right now, anyway) that I don't need more than 12mp.