A neat application that for me will work as a replacement for the feature on Internet Explorer (no longer supported and getting very flaky with newer OSX operating systems) that allowed the downloading of whole websites rather than just individual pages.
A good way to retain a local copy of externally hosted services such as blogs that are composed through the use of web forms and compiled into websites automatically. This could be useful for students who wish to submit blogs/wiki/websites as a part of their assessment portfolios by first making a local copy and then compressing it for upload to drop boxes and audited submission tools.