FierceHealthIT had an interesting link to an article on PHR standards development:
Health insurers, HL7 team to create portable PHRs
Its nice to hear that HL7 is developing a PHR standard, however, I wonder if companies like Microsoft (see HealthVault) will the ones to create a de-facto, practical PHR standard that one can actually implement using existing tool sets. From my own experience with HL7 v3, I don't have much confidence that standards committees can put together something that is practical in implementation. See my previous post on HL7 v3 implementation.