> Play your music online?

Yeah, provided you have the bandwidth. If you don't, any OS has music management software.

> Play your video game online?

You got me there - not yet. Half life doesn't work in Flash.

> Type papers online? And no, google apps don't quite cut it :P

You can, but if you don't want to, any OS has productivity software.

> Watch a dvd online?

Yes.

> Do your taxes (in a Turbotax) fashion online?

Yes.

And just where could you store this music? ;)

And you can't type papers online. Google apps are so crippled.

You can't watch a dvd online last time I checked...

...And I know of no way to do (Turbotax style) taxes online.

Store music? huh? * go to one of a billion music playing websites * Search for the track you want * Click play

It depends what you mean by DVD. If you're talking about a physical DVD, then obviously no you can't. If you mean play the movie/tv show, then yes obviously you can.

There are about a billion music playing websites that have sprung up in the last few months.

Video games, I've not been a PC gamer for a long time, so a wii makes sense for that, although there are a few good games being written for the browser.

Google apps works well enough...

Sure you can watch DVDs online... I watch TV shows etc in my browser.

Seriously, for most people there is no need for desktop apps anymore.