I use multitasking the most when I'm browsing the web. When browsing, I quite often have a couple of sites open, such as Twitter, Facebook and a few pages on what I'm actually looking at. I switch between these windows, and in addition I usually have a music player or an IM chat going on as well.

But I like to keep my programs closed when I don't need them. I don't use multitasking to just have everything ready in the background. Once I'm done, I close all windows and open apps.

Most crucial for me in multitasking is moving information from one view into the other. This is where computer-like copy+paste functions and keyboard shortcuts (such as ctrl+a) come in handy. This is, of course something where Maemo really delivers. But I see that these functions are a great aid in multitasking, and perhaps even the functions that allow truly utilising it.