Most And Least Common Four-Digit PINs

An analysis of 3.4 million four-digit PINs.

Some tidbits:

The most popular password is 1234 -- nearly 11%
The next most popular 4-digit PIN in use is 1111 with over 6% of passwords being this.
In third place is 0000 with almost 2%. 

Hence, "a staggering 26.83% of all passwords could be guessed by attempting these 20 combinations!"

The least popular 4-digit password was 8068.  Many more interesting bits of data in the full article.

(Via Bruce Schneier.)