Remote Administration via Webmin
One of my favorite little helper applications for administration is Webmin. It seems to be an often forgotten workhorse. In addition, if you're having trouble understanding all the ins and outs of a certain application's configuration, Webmin takes a bit out of the guesswork for you.
Webmin has support for a wide variety of operating systems. You can also browse the typical supported modules. At least for Linux, this pretty much covers the majority of things you would use a Linux box for: Apache, Samba, BIND, Squid, to name only a few.
A Java-based File Manager applet is included, for typical file operations. You can also upload remote content or use a HTML-form based "command line" utility.
Obviously, there are security considerations. I tend to use it to remotely interact with my home network while I'm at work. It's great for transferring small documents to and from home, or possibly accessing multimedia without a specific purpose web server.
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