For once, a tip instead of a question.

[緑さん]

For users with japanese enabled computers. Aside from that and a link, nothing really needs to be said about this.

yomigana.com

[Buckaroo Banzai]

すげ〜！このウエブサイト！だれがこのウエブサイトを 作ったのか。

[Charles Barkley]

You can do that with any online dictionary, however. The only thing different about that one is it has no additional features. This is your one stop word-lookup link

http://www.csse.monash.edu.au/~jwb/wwwjdic.html

[82riceballs]

すげ〜！このウエブサイト！だれがこのウエブサイトを 作ったのか。
I have a question. Is the "Ka" at the end of your sentence the question particle? Would the sentence still be fine without it?

(I'm trying to learn Japanese via reading :-)

[Buckaroo Banzai]

Yes, it is acting as the question indicator particle. I could omit it but if I were to omit in speech then I have to make sure to keep the rising intonation to indicate that I'm asking a question. Otherwise it would be construed as a statement. Of course in writing you have to have something to indicate a question though.

[Toritoribe]

だれがこのウエブサイトを作ったの sounds more natural. だれがこのウエブサイトを作ったのですか as well. The sentence is read as an interrogative one, since the interrogative だれが is at the front.
more simply, just add "?" ;-)

[82riceballs]

Thanks, guys! Your lessons really help improve my Japanese!