Home Page: Link
Upload the images into a new directory via ftp or similar, go to
shimmie's admin page and put that directory in the bulk add box.
If there are subdirectories, they get used as tags (eg if you
/home/bob/uploads/holiday/2008/ and point
/home/bob/uploads, then images will be
tagged "holiday 2008")
Note: requires the "admin" extension to be enabled