On my other blog, I addressed typical grammatical errors. I'm too lazy to go find the link, but here's another mistake that's currently driving me NUTS.
Lose- I'm going to lose weight by chain smoking and doing crack. (Kidding. I'm just going to stop eating instead.)
Loose- My clothes are going to be loose.
Losing- I'm in the process of losing my Christmas present to myself... my extra pounds.
Loosing- No. Just... no. NO.