If I understand correctly you want a utility that downloads your favorites, and save images with the tags as file name (for searching)?
There are multiple downloaders that can have this function, as:
- Imgbrd-grabber: http://code.google.com/p/imgbrd-grabber/
- Danbooru downloader: http://nandaka.wordpress.com/tag/danbooru-downloader/
- Tagbooru: http://code.google.com/p/tagbooru/
- v7 Posix sh grabber: http://code.google.com/p/danbooru-v7sh-grabber/
- Danbooru batch downloader (but I think it is less handy than the other ones for what you want to do): http://snipt.org/HMg
- Danbooru robot: http://code.google.com/p/danbooru-robot/source/browse/#svn/trunk
I haven't tested them all, so maybe some of them are outdated.
forum #16341