Their live album "Rocking The Fillmore" is really very good - I once picked it up for a 5€ or so and I love it! They also did a tribute to the Stones and played Honky Tonk Woman live. You are right about Peter Frampton - that guy once knew how to rock!
I started a thread about Humble Pie about a year ago and I remember that there was someone on this board who jammed with a son from a Humble Pie member... can't remember who it was, though!