This firefox add-on will help you by openning the save dialog already pointing at the right folder location according to filters you set.
The filters are based on filenames and domain's name.
This extension works with automatic file downloading and left click on a link only, no right click for the moment.
You won't need to search the good folder for hours anymore, ASF will open it for you automatically.
Note : Compatible with Firefox 3.1 beta 3