Pretty plant ... I have a similar one, and I think they are the genus Echevaria, however I believe they hybridize easily and differ from even garden to garden. It is night here so will take another photo tomorrow, as it is flowering, and you can see the similarity. I am in Victoria Australia and it multiplies very quickly here.
Guzmania2010's plant is Sedum palmeri, we've covered that in another thread.
Angie's plant is one of the many forms of Echeveria elegans (pictures at http://www.crassulaceae.ch/index.php?TPL=10122&x270_id=1131 ) This Echeveria species is quite variable, so it's worth growing more than one form in a collection. They all have the pretty pink and yellow nodding flowers though.