I have a website saved in Dropbox folder and I successfully worked on it for days without any problems with publishing. When I opened that site today in WebMatrix on another computer, I had to configure publishing settings again off course. I did that and tried to publish the site with only one file modified, but I was surprised when I saw all files in the publish dialog marked for upload.
One thing came to my mind - to copy site configuration from first to second computer so that second computer has information about already uploaded files and continues to publish just the modified ones, but I don't know if the site configuration is stored in file or registry or something else...
So, before I start digging I decided to ask the wise ones here :)