A good password to is made up of 3-4 words with a mixture of case, numbers and punctuation (e.g. BIG@66Green!Monkeys).
The two main reasons this is a good combination:
- Easier to remember and completely random.
- The number of bits in the characters will insure that if a brute-force method is used to gain access to the account, that it would take about 374 trillion years to unencrypted.
Test to see how secure your password is: www.howsecureismypassword.net