I thought it would be interesting to try Google Chrome. It was and is.
I use Chrome on and off during the day and it is interesting. Fast, yes, stable, so far. Slow on add laden sites like PCA but it is a Beta. Some very interesting features, particularly the way tabs are used and the summary favourites home page/new tab feature.
The key though is the importance of the browser to cloud computing, more theoretical than actual now but at the speed things are going it could be more actual than theoretical very soon.
For a bit of fun I signed onto Google Calendar and imported my MS Office calendar. I chose Google calendar + BBC + PCA as my start tabs and low and behold all three fire up as my browser opening. I think we will see, very soon a real challenge to MS and that is excellent for us as consumers.
In terms of a replacement operating system, it could be a while away yet but we live in interesting times. Do not think this will be a free ride, it is now, mostly but if cloud is to succeed it will need more than advertising to support it. We will pay for the use/storage perhaps monthly and ultimately if the main servers go down, so will you.