Actually I'm posting this cause lots of people are asking me about what program should i use to do this and to do that, anyway these are my preferences they can be not the best things ever.

OS: GNU/Linux
linux destro for laptop/desktop: ubuntu, but planning to move my desktop to gentoo soon.
linux destro for servers: debian stable, though i use some packages from unstable repository. planning to try gentoo soon.
desktop enviroment: gnome & xfce. planning to try enlightment soon.
terminal: xfce-terminal, i like it.

web server: apache, planning to try lighttpd soon
database server: mysql
content management system: drupal
monitoring servers: hobbit, planning to look at nagios soon

browser, gui: firefox. i was trying to switch to sea monkey for better performance but i found out that the difference is so small when i disable most of the extentions. I still use opera sometimes but not much.
browser, cli: lynx
mail client, rss feed: thunderbird, though it's not the best one in performance, but it's an rss feed reader too. Actually if sylpheed supported arabic it would be my best choice for sure and i would use liferea as a feed reader.
IM: gaim gaim gaim, don't hear to anyone says somethings like amsn and yahoo messenger. anyway kopete is nice if you are a KDE guy (which i'm not).
irc, gui: xchat, though i used gaim for sometime, but xchat rocks.
irc, cli: irssi
voice calls: skype.
twitter client: i used to use twitux, but actually i found that adding IM to twitter and recieving/sending the updates from gaim is much better.
downloads - gui: d4x, kget for kde
downloads - cli: wget
Google earth: google earth, i don't know what category can i put this one in.
peer to peer: amule & bittorrent

cd burner: brasero. k3b is a good option if you use KDE
movies and videos: vlc media player
mp3s and audio: xmms

text editor, gui: gedit, mousepad, & katoob
text editor, cli: vim
word processor: abi word, open office
spread sheets: gnumeric
pdf reader: just the normal document viewer, no need for acrobat reader.

eye-candy: compiz fusion
eye-candy taskbar: avant window navigator

Checking multiple wifi signals: wifi radar
lan packet spoofing: wireshark
security auditing: nessus
firewall: iptables ;)

Islamic prayer times: minbar (i stopped using this cause i started to use the firefox extention instead)
Zekr: for quran search.

if someone got any comments/recommendation for other software please tell me, i would like to get new experiences