TBL has already apologised for that:

http://www.w3.org/People/Berners-Lee/FAQ.html#etc

It depends on your CPU scheduler and your throttling algorithm, too.

I run BOINC on linux. BOINC is "niced" to have an idle priority, meaning that CPU time is only granted to it if there's nothing better to be doing. In addition, I used the on-demand frequency governor which I have instructed to ignore "niced" processes when determining whether to spin up the CPU.

As a result, yes, BOINC only uses spare CPU cycles and not too many of them, either.

What's the point of a Tablet? Well the market for PDAs has basically disappeared. If you don't fancy paying ~£800 for your handheld computer (£30/month contract for 2 years plus the initial cost), Tablets are the way to go.

The linked ICANN blog suggests http://xn----rmckbbajlc6dj7bxne2c.xn--wgbh1c/ as an example.