SPF gaining traction?

As I was signing up for a few mailing lists, I was glancing through the confirmation / welcome messages and I see that there are now some SPF headers showing up in those checks. The ezmlm list manager program includes the full body of the subscribe/confirmation message in its responses:

Received-SPF: pass (asf.osuosl.org: domain of tgh@tgharold.com designates 69.36.9.168 as permitted sender)
Received: from [69.36.9.168] (HELO omega.jtlnet.com) (69.36.9.168)
by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 25 Jun 2006 19:04:13 -0700

A quick glance through my other mailing list confirmation messages didn't turn up any more. Other mailing list software doesn't reflect back the sign-up mail message so it's not possible to see if SPF checks are being used or not.

I run a very strict SPF record for this domain. I wish companies would check the SPF record before bouncing messages back to me (due to joe-jobs by spammers).