Sentence: What kind of website do you like?

[Tsy]

Firstly, I'm not an English native speaker. Sorry for any mistakes that will might occur. I'm from Bangkok, Thailand. ^_^

I have searched this forum for the questions that might be relevant and found some.
http://www.english-test.net/forum/ftopic12487.html
http://www.english-test.net/forum/ftopic12063.html
http://www.english-test.net/forum/ftopic19142.html

My friend asked me if this sentence is written correctly.
"What kind of website do you like ?"
At that time I was confused if there should be "s" after "kind" and/or "website".

And is this sentence correct in the following situation ?
I've made some kinds of weapon(s ?) which there are only 3 ones existing . (this also makes a question itself. xD )
---
Question: Hey, what "kind" of "your weapons" have you sold ?
Answer: Well, I've sold the weapon A and B yesterday.
and
Question: How many "kinds" of "your weapons" have you sold ?
Answer: I have sold 2 types of my weapons.
---
This sentence is from Dictionary -Collins Cobuild-.
Had jamie ever been in any kind of trouble ?
What makes it's not necessary to have "s" after kind and trouble ?

I've already asked this in a Thai forum.
http://www.pantip.com/cafe/library/topic/K6950143/K6950143.html

Thank you everyone. ^_^

[Mister Micawber]

.
These are OK:

"What kind of website do you like?" (one kind)
"What kind of website do you like?" (several kinds)

I've made some kinds of weapons for which there are only 3 in existence. (several kinds of weapons)
I've made a kind of weapon for which there are only 3 in existence. (one kind of weapon)
---
Question: Hey, what kind(s) of weapons have you sold ?
Answer: Well, I sold weapon A and B yesterday.

Question: How many kinds of weapons have you sold ?
Answer: I have sold 2 types of my weapons.
---

Had Jamie ever been in any kind of trouble?
What makes it not necessary to have "s" after kind and trouble ?-- The speaker is merely imagining any single kind.
.
_________________
Native English teacher at Mister Micawber's

[Sitifan]

[Mister Micawber]

.
Yes, I forgot the esses. An occupational hazard of cutting and pasting.
.
_________________
Native English teacher at Mister Micawber's