MacClipboard is a Gimp plugin to support cut and paste of images with native Mac OS X applications.
Version 0.3 adds support for pasting into grayscale images as well as improved handling of pictures copied from Carbon apps like Photoshop and GraphicConverter. Images can also now be extracted from rich text copied from TextEdit.
Source & binary:
http://prdownloads.sourceforge.net/gimp-mac-helper/macclipboard-gimp-0.3.tar.gz?download
Release notes:
http://sourceforge.net/project/shownotes.php?release_id=250538
Bug reports:
http://sourceforge.net/tracker/?group_id=112414&atid=662137
Feedback would be highly welcomed, particularly about compatibility with particular apps, and whether the binary works as-is with various Gimp distributions.