Here are a few more...
To: Let's go <b>to</b> the store.
Two: Let's buy <b>two</b> bottles of Pepsi.
Too: That's way <b>too</b> many bottles of Pepsi. Or: I like Pepsi <b>too</b>.
There: <b>There</b> are too many people in here.
Their: <b>Their</b> house can fix that many people.
They're: <b>They're</b> going to invite us over there in stead.
Than: I have more money <b>than</b> you do.
Then: <b>Then</b> why don't you share with me?
Not to be a stick in the mud, but people always get those ones wrong.