Yes, this is what Yahoo Messenger will look like when installed on Vista. The interface is super cool and users have more control over the looks which allows changing the color ( Take a look at the end of image, a slider allows you to do so ). The only bad news is , you might have to wait for a while to get it on your windows Vista machine.

Update:

• CLICK TO READ Yahoo Messenger For Vista : Preview Release is finally here
• You can also record Yahoo Messenger Voice call with this software

For Vista Version of Yahoo Messenger, they had been working on

• Performance optimization
• Integrated feedback system for bug reporting and feature ideas
• Tab-based navigation
• Ability to install both versions of Yahoo! Messenger for Windows on the same computer at once
• Updated visual design for desktop icons and Sidebar gadget
• Vector-based animated emoticons
• Aeroglass window integration

So stay tuned fellow, its coming!!!

Till that time lets take a look at the features of it:

• Integrated Yahoo Messenger Sidebar widget .
• Compatible With Windows Live Messenger.
• Change the look and feel of yahoo messenger.
• Automatic groups are created in your contact list based on your Yahoo! interests (i.e. Yahoo! Sports Fantasy Football league).
• New emoticons, program icons and alert sounds.
• Arrange All your chat windows in tabbed fashion, so your screen is less scattered.
• Includes Fantasy Sports like Fantasy Football which allows you to enjoy the games with your chat buddies.
• Check out the Video on Yahoo Messenger For Windows Vista

Keep track of the post, I will be updating as soon as they release it.

• If you want tabbed window feature on Yahoo Messenger 8.1 refer to this post hack-to-get-tabs-in-yahoo-messenger
• Check out the Latest Yahoo Messneger for MAC with Tabbed IM