A great way to keep your laptop cool is to remove the battery when it’s plugged in. Just be careful not to unplug your computer without the battery.
If you want a strong password, that isn’t too hard to remember, try out http://www.safepasswd.com/
If that’s still too difficult for you, try picking a song or phrase you like (with a title that is at least 8 characters long) and replacing some of the letters with numbers or symbols. “ExpresstekIsGreat” could become “3xpre55tekI5Gr8”. There are no real words used, making it much more difficult to guess.
You can use Duplicate Commander to search for and delete duplicate files on your hard drive. It’s a great way to save space and keep things organized.