Insert and view web pages real-time in Microsoft Power-Point: http://skp.mvps.org/liveweb.htm.
Merge mp3 files: http://www.shchuka.com/software/mergemp3/mergemp3.zip.
Image files can be mounted onto a virtual drive from your hard-disk or from a network drive and used in the same manner as inserting them into a normal CD/DVD drive: http://www.slysoft.com/en/virtual-clonedrive.html.
Dropbox is an easy way to store, sync, and, share files online. It works seamlessly with any operating system and automatically makes sure files are up-to-date: http://www.dropbox.com.
Site to remove passwords and restrictions (such as printing, copying text, etc.) from PDFs: http://freemypdf.com.
BitLet is an online torrent downloader which runs entirely in your web browser. It allows you to download files using bittorrent without having to install
any client program on your computer: http://www.bitlet.org.