Kumikyoku [Nico Nico Douga] (組曲『ニコニコ動画』)

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So I was just introduced to this Nico Nico Medley from a friend, and I would like to know more about these song(s). I have heard an instrumental version (http://www.youtube.com/watch?v=Wcm9gbsgmXo) as well as what is known as the J version (http://www.youtube.com/watch?v=QiCHi_mWbR4)

My best friend Google directed me to the following: http://tinyurl.com/22qvq7 (Wikipedia)

Judging from the looks of the Wikipedia article, am I correct to say there are four 'official' instrumental productions of this song:
and the last version seems to be the largest, most complete compilation of the previous songs?

Apparently there are several vocal versions of 組曲『ニコニコ動画』 , the first song, done by different singers and/or remixers. Are there vocal versions of the other three songs?
I already have the instrumental of the first song, but where can I download the other three?
Where can I download the more popular vocal versions of these songs? I already have the J version, but are there any other notable versions?
Also when were these songs first produced?