Tick: The reason why I am actually opposed to this is because I am looking at this from a minimalist pov. I like a small contact list that blends into the background while still being able to read statuses and aways.
It would be possible in the big window but it would mean having a big window all the time (given that it wouldn't be collapsable to the bar) If it would be then there's only my gripe with the missing opacity as it wouldn't blend in that well.
Basically what I am also getting at is that I don't quite get the advantages of such a mockup over the current implementation. We were looking at the necessity of tabs weren't we? I don't see this problem solved well as we would basically have a bigger message window than we do now.
What about a window where you have the contact list on the left. In a big window, but when it's not active, it goes to transparent or what ever, and then hides the message view that is in the same window.
So for example. You see that you have a message from a contact. When you press the contact-list/adium it folds out into a full window. And there by you can either have it as tabs for multiple messages or on the left side. It would be like a Mail.app similarity, but it would still fold in and be minimal.
Although, I don't know if you would need coreimage to draw everything.
But what do you guys say ?