HP support Debian lenny on ProLiant G5 seriesDebian 5.0 ("lenny") has landed, and now HP officially supports it.
The first downloads are available on the regular support pages. I've been waiting for this to happen for a very long time, and will now test what has been delivered.
Update: the ILO components seem to be missing from this initial release, but hpasm, hpacucli are fully functional, and I suspect the other software packages will work too (hpsmh, hpadu, hp-snmp-agents, cpqacuxe). Manually installing ia32-libs was necessary on amd64, as hpbootcfg crashed without it.