There's no such thing as too chibi.

But yeah, the Twilight anime should have stayed closer to its roots. >>
So, here's the order I got stuff in:
-Legend of the Twilight vol. 1
-Legend of the Twilight vol. 2
-Legend of the Twilight vol. 3
-AI Buster
-AI Buster 2
Twilight was for a long time considered the end. So be expected to go "omgwtf?" in the last volume at a few parts. So two weeks later when I bought AI Buster (which is placed first) I went "Ooooooooh, now I get it!" I do recommend the order I bought them in. You gain answers as you read, but still the constant mysteries of the world of .hack remain. And that's a cool feeling. Plus, they're all written by the same guy so it flows well.
And don't believe AIB2's name. It's not a true sequel, instead it's five stories told from five different characters.
[SPOIL]-First is a retelling of AI Buster from a different perspective.
-Then a continuation which goes from the beginning of Sign to the end of the original four games.
-A story of the antagonist of Twilight from her perspective. Thankfully, it still shows what a b!tch she truly is. XD
-A little origin story of Rena that is retold from the time of Twilight vol. 1.
-A little orgin story of Hotaru before she met Shugo.[/SPOIL]
All in all, a pretty good read but it lacks focus. ^^
EDIT: And oh yeah, the AI Buster novels are in English! XD I'm not sure if Zero is, still looking for that. In June the first of the four-part Another Hero series comes out here, a retelling of the games from a different character's perspective, which is good for fans like me who don't have a PS2. Whee. XD
.hack was never that popular... But it should have been! And the manga was always planned to be a mini, orginally it was planned to only be two volumes. There was enough to make four, but that decided to squish it all into three for some reason.
Yup, the novels are appearantly in the UK. Because if not, someone's going to have to explain why the UK price is on the back cover of AIB2.