Because I was looking for that last year (before we bought a Quantum Library) and couldn't the answer to it, I will post that short information and maybe you could update the "Unofficial tape library compatibility list".
Scalar i40, i80, i500 & i6000 Tapelibraies are officially supported with Veeam version 7.0. I believe version 8 will be supported soon. You can find that here: http://www.quantum.com/swcompguide.aspx
For the HP
Libraries, you can find the information here on Page 29: http://h20565.www2.hp.com/hpsc/doc/publ ... cale=en_US
I hope this helps someone to decide which tapelibrary to buy.