Ahoihoi

Start Ahoihoi when Windows starts
Allow multiple instances (Cloning)
Snap the buddy list to screen edges
Dock the buddy list window
Auto-hide the buddy list window
Hide the buddy list Taskbar button
Display general buttons on the buddy list
Display your screen name in the buddy list at the top, bottom or scrollable
Display your buddy icon in the buddy list
Display your buddy's buddy icon in the buddy list on the left or right and the icon size is adjustable
Display offline buddies in the buddy list
Display mobile buddies in the buddy list
Display friendly names in the buddy list
Display the buddy updates indicator in the buddy list
Display a buddy's status message in the buddy list
Sort buddies alphabetically in the buddy list
Sort buddies by status in the buddy list
Auto reconnect when the connection is lost
Connect via proxy server (SOCKS4, SOCKS5, HTTP, HTTPS supported)
Show new IM windows focused, not focused or minimised
Flash the IM window when a new message is received
Group all message windows in a single tabbed window
Auto reply with your away message when you're away
Specify a messaging font, colour and style
Log instant messages and chat rooms
Specify privacy settings
Specify sounds for buddy events and new messages
Customise the buddy list colours and fonts
Sign on as Away or Invisible
Lock Ahoihoi with a password for added privacy
Linked screen names
Pop-up notifications of buddy events and more
Offline messaging

Broadcast messages to multiple or groups of buddies
File transfers with a File Transfer Manager
Secure (encrypted) messaging
Display the music you listen to in your status message and/or Buddy Info (Supports Winamp, Windows Media Player, Foobar, iTunes and Songbird)
File Sharing (share files or folders on your PC)
Set file sharing permissions per buddy or groups
Use AIM Expressions (buddy icons, sounds, wallpapers and emoticons)
Spell checking as you type
Auto-adjust the buddy list height based on visible buddies
Set per-buddy logging of messages and events
Real-Time messaging
Set per-buddy sound settings
Set per-buddy notification settings
Plugins support
Graphical themes
Windows 7 support including a Jumplist and an Aero theme on the Buddy List window
And lots more...