Tags for Mac OS X

People nowadays are very fond of tags. These tags are e.g. used for Flickr, social bookmarking sites such as del.icio.us and many more. Now there is an application that brings tagging to your desktop in Mac OS X, it is simply called Tags. It seems that tags work with all the major applications for Mac OS X, such as Office, iPhoto, iWork, and many more (see full list of supported apps here). You can then search for the previously applied tags using Mac OS X integrated Spotlight search. Even Apple's Mail application is supported (where I would use it most), but unfortunately the tags for Mail are only stored locally at the moment without the support for IMAP. So, syncing the tags for Mail between different machines does not work yet. They promise though that they work on adding the IMAP support for Tags via Mail. When this would be added as well, I might consider giving it a try, but for now this missing feature is a show stopper for me (at least for the moment).