We've been doing a lot with ProCurve switches at work, and I was asked about getting certified. I can't seem to find any study materials for these exams though. Maybe you guys know something?
Here is an article about upgrading your CCNA to an HP cert. I think there may be some leads for you there:
Cisco Cert Zone: Upgrade Your Cisco Cert to an HP Cert
Work in progress: learning more Python, Advanced Puppet, and oVirt
Next up: studying for RHCE
Control Protocol; my blog of exam notes and IT randomness