Hubapps (http://hubapps.com) has released Attachments, a new companion to Apple Mail, which facilitates finding and using emailed files. It transparently monitors for new files, and provides tools for working with them, including Quicklook previews, cloud sharing, zip, drag-n-drop, search-n-sort and more.
Attachments is debuting exclusively in the Mac App Store for US$4.99. It requires Mac OS X 10.6 or higher and an Intel-based Mac (sorry, PowerPC Macs need not apply).