QDI was a division of Legend Holdings, a Chinese business. It was renamed Lenovo.
http://news.zdnet.com/2100-9584_22-140092.html
http://www.trustedreviews.com/pcs/news/2004/12/08/IBM-Sells-PC-Division-to-Lenovo/p1
I would say the QDI brand is dead. There is no match for it under the Lenovo web site and as you've noticed the prior web site has been hacked and unmaintained for many months.
Edit:
I've found more info:
http://www.pc.ibm.com/ww/lenovo/pdf/03_04/F110.pdf
On page 14 it shows the sale of assets of QDI Holdings Ltd to Swift Glory.
The only other references I can find are to QDI as a contract manufacturing division of Lenovo. In other words, there is still a unit called QDI, but it doesn't do what it used to do.
http://www.indopedia.org/Lenovo.html