1) I think so yes. I think it is far and away better all around on an LE1600 than XP tablet.
2) I do not find any. I do not use bluetooth, so I have not tried to figure that out. I am not sure if there are any issues.
3) I think it works better with 7. I have 1.5 GB of ram, and a mtron SSD.
4) I dont have a video, not sure what it would tell you if I did.
One thing to note, aero glass will not work on the GMA900. There are themes though that can make the aero basic theme look nicer.