Ubuntu中：
Windows --------- Ubuntu

Internet Explorer --------- Firefox, Opera

Microsoft Office --------- OpenOffice.org, 永中office

QQ---------Gaim+挂件,LumaQQ

Winamp -------- Xmms,beep-media-player(BMP), Audacious(将来会替代bmp的东东)

Photoshop --------- Gimp

AIM, ICQ, MSN, Yahoo!, Jabber, IRC instant messaging --------- Gaim, amsn

Word Pad (or notepad) --------- Gedit, nano, vim

Windows Media Player --------- Totem, Mplayer, Gxine

iTunes --------- -for playing music:
-----------------------------Rhythmbox
----------------------for iPod Syncing
--------------------------------Gtkpod

ID3 tag editor ----------------------- easytag


MIRC -------- Xchat

Premiere (Movie Editing) --------- kino

Bittorado --------- Bittorado
(don't you love
native ports)

Dreamweaver --------- Nvu

CDex ---------- Sound Juicer

Nero -------- Gnomebaker

Outlook Express --------- Evolution, Thunderbird

Snood ---------- Frozen-bubble

Partition Magic --------- Gparted

eMule ----------- aMule, mldonkey
Soulseek ------------- Nicotine
DC++ -------------- Valknut
any multitorrent client ------------ Azureus, BitTyrant
any download manager --------------- D4X, Gwget, Multiget
regedit -------------------- gconf

Adobe Illustrator ------------ Inkscape

Remote Desktop Connection ------------ Terminal Server Client

Windows Explorer ------------- Nautilus

Windows Picture and Fax Viewer ------------ Image Viewer (Eye of GNOME)

Paint ------------- Jdraw

Kubuntu中:

Internet Explorer --------- Konqueror

Microsoft Office --------- OpenOffice.org/KOffice

QQ--------EVA

Winamp -------- Amarok (with the small view)

Photoshop --------- Gimp

Aol Instant Messenger --------- Kopete

Word Pad (or notepad) --------- Kwrite

Windows Media Player --------- Kaffeine

iTunes --------- -for playing music:
-----------------------------Amarok
-----------------------------Juk
----------------------for iPod Syncing
--------------------------------Gtkpod

MIRC -------- Xchat

Premiere (Movie Editing) --------- kino

Bittorado --------- Azureus QT/Qtorrent
(don't you love
native ports)

Dreamweaver --------- Nvu

CDex ---------- Kaudiocreator

Nero -------- K3B

Outlook Express --------- KMail

Snood ---------- Frozen-bubble

Partition Magic --------- Qparted

我的推荐
Explorer ----------------------- Thunar(within XFCE)
IE ----------------------- SwiftFox(Firefox)
GoogleTalk ----------------------- Jabbin(VoIP supported)
MSN ----------------------- aMsn(VoIP/Video supported), www.meebo.com (webmessenger: GT,MSN,Yahoo,ICQ etc. supported)
QQ ----------------------- www.imhaha.com (webmessenger: QQ,MSN etc supported)
EMail Client ----------------------- Sylpheed, Claws-Mail(两个轻量级的邮件客户端，比Thunderbird来的快多了)
Notepad ----------------------- MousePad(既然有人提，还是列出来这个，其实偶尔还是有用的)
龙卷风收音机 ----------------------- Streamtuner (比ljf强大多了)
Ultraedit ----------------------- GEdit(这个还是要逊色些)
EBWin ----------------------- EBView(查日文字典的), Stardict
MS Office ----------------------- OpenOffice, EIOffice, GNumeric(表格)
TVKoo, PPLive ----------------------- Sopcast
acrobat reader ----------------------- Xpdf
acdsee ----------------------- GQview