This isn't new, I just thought it was worth noting because it is useful to show an example of a packaging principle when sponsoring new maintainers etc.
deb-gview has been extended via GnomeVFS to view the contents of any .deb in the archive without having to install the package and without having to separately download the .deb itself. Either copy the link address and load the .deb on the command line or configure your browser to use deb-gview as a helper for .deb files (right click a .deb and select open with... or similar). Then just double click on any text file within the .deb to view it. Also works with manpages and images inside the .deb, other filetypes can be supported via a config file. Supports viewing a .deb for any architecture, not just your own (useful to see if the autobuilders have really done what you expected with generated files).
e.g. when advising on using README.Debian, it was useful to give a simple URL to allow the user to easily see the format: