good question!
graphic converter's nice-
as for image management, diiva, typically associated w/ usenet, makes an interesting alternative for image management on the local drive. (it creates a folder 'diiva archive' which can be filled with folders which contain image files- whose folder's image content can be previewed @ a glance more legibly than thumbnails, e.g. like 1in x 2in). an interesting way to manage images in & of itself- w/o even taking online to usenet!
on the commercial side of things- nothing beats cumulus [except it's price ;-) ]!
hope this helps
bon chance,
whomever