I've made a modification that allows a DSpace repository to embed a "preview" of the document into the page, so the user never has to leave, just to get to the good stuff.
Adding a Preview link to the item's bitstream.
Then showing the document with Google Doc's Viewer. It essentially becomes a very easy way to make your content more easily accessible, as files that are MS Word or Adobe PDF don't require the visitor to have those programs installed to view them, and load instantly on the page.
How it works
The Google Docs viewer essentially works the same as the user downloading the document to their computer and having the Adobe Reader display the file for them, however, it uses Google Docs to download the document, and then render the PDF before their eyes in real-time so that they can immediately see the document on that page.
Perhaps we should make this is into a pluggable system for DSpace 1.6 where you can register classes that can render file types, and then make a configurable option to register viewers to filetypes?
UPDATE: The code is available in a writeup at the DSpace Wiki: Document Preview with Google Docs Viewer