ClicksAndWhistles is a free IRC (Internet Relay Chat) client for Windows.
The latest version (v2.0.5) has the following features:
Support for multiple "identities"
Support for multiple server connections
Channel favourite list
Floating (desktop), MDI and tabbed windows
Connection Tree and Connection Monitor
Themes, PNG image backgrounds and outline fonts
Pop-up and sound event notifications
Unicode (UTF-8) support
Text formatting (coloured and bold/italic/underline fonts) with format bar
Keyword highlighting and sound notification
Channel and user logging, log archiving and log reloading
File transfers (DCC SEND) and direct chat (DCC CHAT)
"Connection scripts" (a simple list of commands to run once connected)
Macros (use one command to automatically run a series of other commands)
Customizable message text
Tip: click on a window's icon to pop-up a menu which contains various settings which are saved for that window (example).
Thanks to Mészáros Tamás for the Hungarian translation.
http://www.i42.co.uk/stuff/