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So I ran across this picture of supposedly "Every Sci-Fi Starship Ever" (look at it here for zooming http://img.gawkerassets.com/img/191accgnmnevzjpg/original.jpg)

I was excited to see they have a lot of 40k star ships represented (missing some obviously, like Tyranids and Necrons) but noticed there are some I've never seen or heard of.

Does anyone know where I can find out about that massive Tau/Kroot Battlesphere? What is known about them? What books is it in?

Also never heard of the Rak'Gol before (I'm fairly new to 40k) but notice that several ships are represented. Are they a newer species or an old one the GW hasn't touched upon in a while? What is known about them? Anyone know what books you can find them in?

This is already being discussed here: http://www.dakkadakka.com/dakkaforum/posts/list/554434.page

the kroot war sphere was in the BFG magazine they did in the late 90s early 00s not sure if they ever made one maybe forgeworld but discontinued with the end of specialist games.