iChat Pro makes iChat look like Adium
Personally, I'm an Adium user at heart -- iChat is super nice (especially for a built-in chat program), but it just doesn't have the features and customizability that that Adium does. But if you have to use iChat for whatever reason (easy video conferencing comes to mind) despite your love for Adium, then this mod, sent to us by reader Philipp, will probably come in handy.
It's called iChat Pro, and it basically simplifies your iChat window, squeezing out the borders and cutting the buttons at the bottom. I don't think you can change the colors and design of the display the way you can in Adium (it's been a while since I used iChat, and a quick browse through the preferences didn't reveal any options for that), but at least it looks a little more professional than the, let's admit it, a little goofy, default iChat GUI. iChat Pro is a free iChat mod from Infinise Design.
