In my opinion, I think that if anyone is going to be doing anything at all online, it is important to have an account with Google.
They offer so many services - with the biggest one being email, for the average user.
If you like to take videos and upload them online, they have the market on that with their youtube service.
Many bloggers use their blogging service.
Many others store and use picasa for their photo sharing.
All of their services are free.
You can even use their services to make money with their adsense program.
If you have done a search on the internet, chances are you have already used one of their services.
One thing I do like to keep in mind though, being that they are a free service.
At any time they can stop offering a service or change how it works.
So keeping backups of what you have with them is a good idea - especially for the bloggers.
But that is for another post.