Well by default it looks just like symbian. But on symbian task managers had (everything I tried) the ability to integrate themselves instead of the default task manager and run directly from the home button.

This would be an example of jbak on symbian.

So far all the (one result) I have is from XDA but to customize the home button it seems custom firmwares are required.

I'm planning/researching right now and planning to get the i9000 once I've sold my N900 but the task management is a real bugger so far...