To mount a disk image remotely, enter the following command in Terminal:
% hdiutil mount "http://url.com/diskimage.dmg"For example:
% hdiutil mount "http://a1568.g.akamai.net/7/1568/NOTE: Shown on multiple lines for narrower reading; type on one line with no additional spaces in order to use the command. That command will mount the disk image containing the 45 MB large combo update to 10.1.5. Useful if you only need to retrieve a file or two using Pacifier. The feature is documented in the manual page for hdid, the command line program that is used by hdiutil to do the actual mounting.
1388/061-0008.20020604/download.info.apple.com/Apple_Support_Area/
Apple_Software_Updates/Mac_OS_X/downloads/061-0008.20020604/
MacOSXUpdateCombo.10.1.5.dmg.bin"
[Editor's note: I had no idea this was possible ... and as the tip author points out in the comments, there is a GUI for it. Simply select a ".dmg" file in any Cocoa application, then do Services -> Disk Copy -> Mount Image, and the remote .dmg file will mount -- very very cool!]

