Music, is probably the biggest use for me. In my car, work truck and hooked into my guitar amp via BT. Being able to start a song up in Music Remix Player and tap a button and have the lyrics pop up is great, although not all songs are available due to copyright issues. In that instance, a couple of flicks and I can have them up in another browser window.
BT SMS with my Pre3. I really like this feature.
Web Browser. I know, some people hate it and "can't do anything with it" "too slow"...yadayadayada. It works for me, and to be honest....sometimes it is too slow. That's when I minimize the window, pop open Twitter, or the catalog or whatever, and go back to what I was doing. Frustrating sometimes, but I deal with it. For the most part, I can do what I want to do.
I don't really stream or watch anything on it, except for summer, when it's too hot in the house. If I'm watching something, it's usually on my tv, why watch it on a 10" screen? And as far as people that watch tv (TouchPads) in bed, well I don't last more than 5 minutes anyway. Non-issue.
Next point, I'm sure some will cringe, alarm clock. Depending on the day, I'm getting up anywhere from 3:30AM to 5:30AM, and I use webOS alarm clocks. Note plural, I do use my Pre3 as well. 2 alarms each, staggered 15 min apart between the two and 30 min apart on each device. I have had the missing alarm clock happen, but it has been a really long time ago, I can't even guess when the last time it happened.
I don't play games on it very much anymore, I have piles of good ones that I haven't even played aside from a few times. It would have to be a pretty rainy day though, I think.
That's about it, and emails of course.
If they ever figure out the BT profiles for things like mice, I might reinstall Ubuntu and throw GIMP on it again. I do have AOKP Android on it right now, but it's been at least a couple of weeks since I last fired it up.