Apple

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Airport Extreme
Howtos
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Software

Cool software for your Mac:

MacPorts, the ultimate open source software installation framework (open source)

BibDesk, a graphical BibTeX-bibliography manager - great company for TeXShop and LyX (open source)

TeXShop, a powerful LaTeX editor (open source)

Skim, PDF reader and note-taker - very nice for scientific papers (open source)

Smultron, a general purpose text editor (open source)

Plot, scientific 2D plotting program (freeware)

LyX, a WYSIWYM LaTeX document processor (open source)

OmniGraffle, diagramming and charting tool (commercial)

Keynote, presentation software (commercial)

Vienna, rss/atom newsreader with built-in browser (open source)

CyberDuck, a ftp and sftp browser (open source)

X-Chat Aqua, a fine IRC with an aqua GUI client (open source)

Huevos, a customizable search engine helper (open source)

Camino, aqua browser with Mozilla/Firefox engine (open source)

VLC, a multimedia player for various audio and video formats (open source)

Azureus, a bittorrent client (open source)

FFView, fast OpenGL-powered picture viewer (open source)

Audacity, a graphical sound editor (open source)

GrandPerspective, graphically shows the disk usage within a file system (open source)

SoundSource, tool to switch audio input and output easily (freeware)

ScummVM, virtual machine to play old LucarsArts games (open source)

The Unarchiver, tool for extracting all kinds of archives like zip, rar, lha, tar/bzip2, .. (open source)

MonoLingual, removes unnecessary language resources, freeing up quite some gigabytes (open source)

Airport Extreme

The latest Airport Extreme Basestations come with a very nifty feature: syslog support

To make use of the logging, you need a host running syslogd (most Unix boxes - including your OS-X machine - will do) that is in the basestations network. At the host, edit /etc/syslogd.conf and add a line like

local0.* /var/log/airport.log

and touch the new logfile:

sudo touch /var/log/airport.log

Now you need to make syslogd listen for events over the network. In Debian, you have to edit /etc/init.d/sysklogd and set the variable SYSLOGD right:

SYSLOGD="-r"

In OS-X you have to hack /etc/rc (yuck) and change the line

/usr/sbin/syslogd -s -m 0

/usr/sbin/syslogd -m 0

Now restart syslogd, on Debian via

/etc/init.d/syslogd restart

or on Mac OS X with

sudo killall syslogd
sudo /usr/sbin/syslogd -m 0

Now you just need to configure your basestation with the Airport Admin Utility to log to the host you just configured. (If you have a device that only can send it's logs via udp, you will have to use -u instead of -i - beware that this mode is rather insecure)

Apple also has a knowledge base article on remote logging your airport station via syslog.

Howtos

get a S/MIME certificate into Apple Mail.app (you can get a cert at phpki, too)
Mail encryption on MacOS-X explains useage of S/MIME, too;

Articles

LaTeX Part 1, LaTeX Part 2 - It's Not Just for Academia
Exploring the Mac OS X Firewall, on macdevcenter