Dell XPS M1530 laptop; FreeBSD 7.3; KDE 3.5.10. Konqueror for websites where it works, Firefox when necessary. Thunderbird for email. Text editing in kwrite unless I'm in the middle of doing something in a Konsole, in which case I'll probably use nano. Backups via tarsnap, of course.
On servers, mostly FreeBSD 8.0 (a few boxes are still 7.x), along with djbdns, qmail, ezmlm, apache, stunnel, and tarsnap.
On my android phone: Twidroid, ConnectBot, NetCounter.
For work I use an XPS M1530 with Windows 7, VMWare and a collection of images with different OSes for various purposes. Notepad++ for editing, Eclipse + PyDev for development, Ollydbg and Immunity Debugger for vulnerability research, too many tools to list for penetration testing, OpenOffice for documents and spreadsheets, Google Talk, Thunderbird for mail and TSK and Responder for Disk and Memory forensics.
We have some servers at work, mostly Mac Mini and Linux (to host VMWare, various images from Beos to Sco Unixware), Solaris Sparc box and an old Vaxstation running VMS.
At home I use a 9 year old Vaio SRX-51P/B with a P3 850, 256mb of RAM and Arch Linux. I mostly use Mutt, Chromium, Irssi, centerim, Vim, MC and snownews.
At home I use an Ubuntu 8.04 server mostly for media, printing, DNS (was using djbdns but switched to dnsmasq after a rebuild) and backups and a separate Arch Linux desktop as a MythTV Front/Backend.
On servers, mostly FreeBSD 8.0 (a few boxes are still 7.x), along with djbdns, qmail, ezmlm, apache, stunnel, and tarsnap.
On my android phone: Twidroid, ConnectBot, NetCounter.