I also don't use PIM functionality (is this the "quick and casual" use ysss was speaking of?). I opened the Calendar app for the first time last month because I wanted to see what day of the week a certain date fell on.

For my media use, the N900 is great; it plays audio and (DVD resolution) video nicely (it even streams nicely, using either the built-in media player or VLC), and the FM transmitter works well with my old car stereo.

I'm not a big games player, but my preschool daughter and I both love the "piggies" game (Angry Birds).

I find my biggest "casual" use of the N900 is snapping quick high-resolution photos of interesting things I see on the street, or antics of my daughter. My iPhone friends just can't compete; their photos look blurry and dull compared to the big, beautiful photos the N900 takes. And lately, with the neat BlessN900 camera app, I've had fun taking HDR photos, too.

I have become very dependent on the N900 as my "Hitchhikers Guide To The Galaxy"; I have a desktop bookmark for the Wikipedia search page, and I can look anything up very quickly. Saturday night, at a local Greek restaurant, they had a picture of some regal people on the wall. I then searched and discovered that there's a deposed Greek royal family living abroad, Constantine II and Anna-Marie and their (very large) family... I also keep several on-line translators bookmarked, for when I need to translate something quickly. Also a currency conversion website.

My other big "casual" use is browsing Facebook and Twitter in their original web-based glory; I use PowerTwitter via GreaseMonkey, and it inserts all the posted links, pictures and videos inline into my Twitter feed. I also chat via MSN, GTalk, ICQ, and lately FB Chat.

So I don't know what "quick and casual" uses others have, but mine are all satisfied.