Seriously, it is.  It’s so far ahead of Windows Vista that I’m never going back.  I’d encourage anyone who has the ability (Yale students, for instance) to immediately upgrade to Windows 7 for free.  It took me a total of 3 hours, and has made me a very happy man.

And Windows Live Writer is amazing too.

From Eric Lippert:

There are two closely related definitions for “idempotent. A value is “idempotent under function foo” if the result of doing foo to the value results in the value right back again.

A function is “idempotent” if the result of doing it twice (feeding the output of the first call into the second call) is exactly the same as the result of doing it once. (Or, in other words, every output of the function is idempotent under it.)