Best Riddles of November 2010

Rectify the following equality 101 - 102 = 1 by moving just one digit.

An old lady left $33,333 to be divided equally among two fathers and two sons and each was to receive $11,111.
How was this possible?

What kind of room has no windows or doors?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.
How much did the widow receive?

Rearrange the letters in "new door" to make one word.

I have keys that open no locks,
I have space, but there is no room,
You can enter, but you can't go in.
What am I?

If you say my name, I'll no longer exist. What am I?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Make a sentence consisting of three words that have the whole alphabet.

When can you add two to eleven and get one?