OS X Lion: Suddenly can't login to your Mac? [SOLVED]

I went to make some lunch, and left my Mac running. In the meantime it went into sleep. When I got back, it prompted me with my login password to wake it from sleep.
I entered it about 100 times, very painstaikingly and carefully, but it wouldn't log me in! I did not change my password, and I was certain it was right... but it just wouldn't work. It kept shaking, telling me the password isn't right! I thought I'll have to hack my own computer, and lose my files after upgrading to Lion, but stumbled accross a solution!
SOLUTION: http://baumdesign.wordpress.com/2011/08/17/macos-x-lion-cannot-login-after-autom atic-sleep/
It turns out that I had changed my keyboards input source to German, where the z and y have switched places. The link explains why this happens, and how to prevent it from happening again.
Just wanted to share with you all.

I wouldn't trust a NAS with my only backup, but I leave that to you. From now on I'll assume that your data is safe, no matter what happens. If that assumption is wrong, disaster may be coming.
The next thing to do is to locate the FileVault disk image. Log in to an administrator account that works. Launch the Terminal application by entering the first few letters of its name into a Spotlight search. Drag or copy -- do not type -- the following line into the window:
user=
Now type the short name of the user acount that you can't log into. It should be one word with no spaces. Press return. Enter the following command in the same way (no typing):
sudo ls -l /Users/{,.}$user/$user.sparsebundle
You'll be prompted for your password, which won't be dislplayed when you type it. That's your own login password, not the other user's. You may get a one-time warning not to screw up. Post any lines of output that appear below what you entered, not including the warning.

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OS X Lion: Suddenly can't login to your Mac? [SOLVED]

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