I want to close my account. How do I do this?

Well it looks like he registered within the past 8 days, so its possible he didn't find anything he wanted on the site.
As far as how to do it: what Andy_Panthro said.
edit: though it is possible that the "Registered: Aug 2009" just applies to when he registered on the forums. In which case, disregard the first paragraph.

Nope, it's the same registration, only one account (I'm pretty sure I downloaded the first two free games in November, but didn't start to use the forums until February).

When I used to play MMORPG's there were frequently threads by people's girlfriends, wifes, parents, and siblings asking how to close an account owned by someone they felt was playing too much, or even who they had simply gotten mad at and wanted to punish.
I'm really suspicious of those requests now.

Just don't log in and forget that account then. Why do you want to remove it? :)