ACPI administration advocacy advocacy advocacy opinion alsa amarok apache apple apt aptitude audio audo authentication automount avi awk bash BIOS boot business cache calendar calibre cdr cdrecord censorship commandline computerscience console convert cron cut database date debian degree design desktop development disk dpkg dvd economics education emacs email europe exim faad ffmpeg file files firefox firewall flash foss freedom ftp fun fuse git gnumeric graphics grep growisofs grub gtkpod hardware hardware html idiocy image imagemagick images installation ip iphone ipod iptables iso itunes ivman kde kernel keyboard knoppix lame laptop latex linux locale lockin longlines m4a microsoft mimetypes minitab mount mp3 mp4 mplayer multimedia music mysql network nfs nfs4 nmap openbox openoffice opinion opinion partition pdf perl php politics postgresql printing privacy programming rant remote rhythmbox rss rsync rxvt scp screengrab screenshot script scripting scsi security sed server shell siteadmin sitenews sitesoftware skype skype slackware sound sox spam spreadsheet ssh statistics subversion sudo svk swap t23 t43 terminal text thinkpad thunderbird time timezone ubuntu udev upgrade usb usbmount users uuid versioncontrol vfat video vnc windows wine wordpress wordprocessing X40 xwindows xwindows youtube
You might have noticed that this site has been crawling halt with all the extra traffic it has been getting.
One thing to do is to use a low-memory footprint web server like lighttpd to serve images and other fixed content. The configuration file is a bit different to the Apache one, but if you can configure Apache you can configure lighttpd.
For Apache itself, I'm taking Stas Bekman's advice and limit both the size of the Apache processes and the number of processes spawned using the MaxClients directive.