Add a custom error page for 403 errors and apply the main site style to all error pages.
Use Lytebox (a Lightbox clone) for quick viewing images.
Add a help comment on the file upload dialog mentioning the extra functionality provided by google gears and a link for installing it.
Make the progress bar look less like Windows 95 and clean up the style sheet a bit.
Remove the redundant gss top-level directory.