kind of vs kinds of

Some examples from the web:

• Although being rational is kind of overrated.
• No, I'm kind of tired.
• Then things got kind of amazing.
• I'm feeling kind of weird.
• I sometimes ask those kind of questions.
• Like a kind of gravity or magnetism.
• Some kind of international war-for-profit scheme.
• Jacob's kind of a werewolf.
• Somehow we had some kind of telepathic communication.
• Like some kind of sympathetic nervous system response.
• Some kind of encampment behind this barrier.
• But exile is another kind of journey.
• Sergeant Brody is exactly the kind of congressman we need.
• Witnesses say same kind of truck.
• Sounds like my kind of weekend.
• Clearly there's been some kind of communication error.
• Some kind of fungus or bark rot.
• Like some kind of coma or something neurological.
• A real, kind of, salt-of-the-earth...
• Glad you found some kind of peace.

Some examples from the web:

• Create different kinds of subtotals to a database.
• There's various kinds of sprinkles and marshmallows.
• Security levels vary widely for different kinds of vehicles.
• Meetings in these kinds of environments are optional.
• You should be able to cultivate the right kinds of friends...
• Good with these kinds of statements.
• Those blooms are generating other kinds of chemicals.
• Typical uses are various kinds of measurement applications.
• Furthermore, SWFs have comparative advantages over other kinds of institutional investors.
• Only two kinds of people use payphones.
• Some kinds of pressure-treated wood can contain arsenic.
• At the cafeteria they serve three different kinds of dessert.
• Polarity Magnetics does, or did, primarily two kinds of research.
• Unfortunately these kinds of red flags require me to refer your case to our fraud investigation department.
• I always heard there were 3 kinds of suns in Kansas.
• There are two kinds of men.
• Certain kinds of ghosts, maybe.
• There are many kinds of secret weapons in China.
• There are two kinds of students in this class room.
• For certain kinds of criminals, partying hard serves an important management function.