I use Name Mangler to rename the screenshots that I use for MacStories. Aside from the more complex image resizing and renaming workflow, Name Mangler is just great at picking up your active Finder selection and launching with a preset ready to rename multiple files at once with one click.
The latest update to Name Mangler adds support for Mavericks tags in the File metadata dropdown menu: if a file has a tag assigned, Name Mangler can use a tag’s name as a token in a renaming preset. I won’t use this for my screenshots, but I have some ideas for Hazel integration.
Name Mangler is $19 from Many Tricks’ website.