I have the video uploaded on my home directory, but I don't know for how long I can keep it there.
The video can be found
http://home.student.utwente.nl/n.j.hoeijmakers/LAGB/mappingtutorial.avi. Use right mouse click and "Save target as".
I have watched and I must say it was interesting, but I have to put some notes at it. First, you merge everything with the background, resulting in using the eraser and overwriting areas on the grid. If you keep layers (not a separate layer for every pasted part, but something like buildings, trees, road, stones, cliff and decorations). By doing this you don't have to worry much about erasing to much and if the road is placed wrong, then you can easily move it.
Second, you once told me that the items have to fit the grid, but when I look at the northhouse part, the tree and house don't fit the grid or am I missing something.
For the rest it was a really good tutorial.