Back in August, I noted here that HP announced support for Debian on ProLiant servers.

Recently, the first set of concrete deliverables resulting from that decision became available, in the form of freely downloadable hpasm and hprsm packages in Debian format. I've just learned that customers can now purchase support Care Packs for Debian 3.1 (Sarge) running on enabled ProLiant servers! This offering includes 9x5 and 24x7 Care Pack service for Debian available in 1 year and 3 year contract options. These service products are now available, as of December 1, 2006, on the HP Corporate Price List. Speak to your local HP sales rep for details.

The list of currently enabled server models, the downloads, and related documentation are available online at http://www.hp.com/go/debian.