Clutch Problems

My car has recently had a couple of episodes where the clutch pedal all of a sudden locks up and I can barely push in the clutch far enough to change gears. I have no clue why it's doing this but it's getting really annoying and unsafe. The video below is the noise that it makes whenever I push in the clutch pedal.

http://www.youtube.com/watch?v=1qIxyfvPnYs

If anyone has any insight into this please let me know ASAP. I drive close to 500 miles a week for work and having my car not running is not an option.

My only guess is the throw-out bearing. There is a rumble to the clutch pedal when pressing it but it's not terrible.