My favorite software with Windows

Internet

Trillian (or Gaim) : multiprotocol IM client (MSN, IRC, ICQ, AIM, Yahoo!, Jabber/GTalk)
- SkyLlian : plugin to have Skype contacts in Trillian contact list and be able to chat with them in Trillian
- TrillAlice : a chat bot that can talk to your contacts !
Thunderbird : mail client
- see Thunderbird
Firefox : web browser
- see Firefox
RadioFrSolo : a streaming radio player with a database of all french radios
CesarFTP : a comprehensive ftp server
RealVNC : to give remote control of your computer

SpeedCommander : replaces Windows Explorer, with tabs, ftp client and a lot of other features
Notepad++ : replaces Windows Notepad, with tabs and a lot of other features
- FunctionList
- Hex-editor
- Compare

Winamp Light
- MiniLyrics : a plugin for downloading and displaying lyrics while playing (supports synchronized .lrc files which permit to highlight the line which is currently sung).
MP3Tag : good mp3 tag editor
Easy CDDA Extractor : mp3 encoder/decoder