LittleBigPlanet 2 is just around the corner and you may need to do some Spring cleaning on your hard drive if you want to play the game on release. Very similar to the recent Gran Turismo release, which required a pretty hefty install, LittleBigPlanet 2 features a mandatory install before starting up the game for the first time. So make sure you some space available.
If you do need to do some cleaning, make sure that you have at least 1.5 GB of hard drive space available for the install. LittleBigPlanet 2 will release in North America on January 18th, in the US, Europe on the 19th, Australia on the 20th, and finally in the UK on the 21st.