You can still download files manually by right-clicking them and selecting Save As, although in both Google Docs and Zoho Viewer you can select to save-out the file after viewing using the menu options.

Describing itself as a ‘document harvester', OutWit Docs is a clever little plugin that transforms Google into an office document search engine. Just click the OutWit button next to the home icon on your browser toolbar and a separate search window will open. Entering a search term in the usual search field at the top right will search Google but only return Microsoft Office, OpenOffice.org, CSV or PDF files.

As such, OutWit Docs is an excellent business research tool. Double-clicking any file in the results will download and open it instantly, while you can "catch" documents for further investigation later by dragging them to the Catch box. By checking a box beneath the Catch box you can also cause the files to be downloaded automatically when they're caught.

Although it's not the prettiest add-on, OutWit Docs is first-rate for those who have to search online for business materials.