Aside from the usual web browsers, email client and office suite, what is installed on your laptop? Over time I collected a number of useful utilities, amazing enough, most of the onces that that I use daily could still fit on a floppy.
Yes, my laptop is running windows, with good reason but thats a different discussion.

PuTTY

A free SSH client that I use all the time, mostly to connect to systems for which I don't need to load a saved session.

3CDaemon

A small TFTP, FTP and Syslog server. Nothing to run 24/7 but very handy to quickly set up a server to transfer files. I mainly use the TFTP function to upgrade devices and copy config files.

SecureCRT

This application isn't free but it is the one I mostly use to access serial consoles because it allows me to store different profiles for different devices. I also use it for my larger list of SSH bookmarks, SecureCRT handles those better than PuTTY. If anyone knows a free alternative, let me know but don't dare to suggest hyperterm ;)

ipcalc

Simple command line (or web) ip calculator - useful when calculating netmasks on a monday morning

Active Directory Explorer

One from the sysinternals collection. Useful when looking up the full DN of an object in AD in case I can't reproduce it just by looking at the AD structure.

BIND Dig

Dig for troubleshooting DNS issues because standard windows nslookup is just so horrible. It's included in the BIND package for windows, you can just copy the required files for dig without installing the full BIND of course.

Metapad

Just as a notepad replacement.

VIM

A real editor.

TrueCrypt

Used to encrypt my data partition so in case my laptop gets stolen, they will have a lot more trouble accessing the good stuff.

Of course there is a lot more (firefox, winscp, filezilla, openoffice, msoffice,...) but everyone already knows those.
Just by looking at this list, I don't think it would be difficult to figure out what my job is.