• The Cairngorm wiki @ Adobe is a nice starting point
• AboutNico linked me to this great pdf written by Digimmersion – it’s called “Flex Application Design for Cairngorm” and it’s just incredible how difficult this gem is to find using your favorite search engine … thanks Nico!
• AboutNico also has a Cairngorm 2.1 sample application
• Renaun has a nice Cairngorm store example with support for 4 different backends (ColdFusion Remoting, AMF3, AMFPHP, AMF0). See it live here
• The FlexCoders Yahoo! Users Group currently returns almost 4000 posts about ‘cairngorm’ so that might also turn out the be a great resource.
• Adobe has a proof-of-concept application called NoteTag – and it uses Cairngorm – “NoteTag is as a reference application for Flex developers building their own large-scale Flex applications. NoteTag consists of several reusable libraries and over 200 source files, so there’s a wealth of detail in the ZIP file in the Requirements section.” — I haven’t checked it out yet, but from the description it looks very promising.
• Cairngormdocs.org – this is also a resource which doesn’t show up in Google searches (I stumbled upon it in this presentation from MAX2006). Not too much there yet, but it could turn out to be a good resource as well.
• Over at Cairngormdocs they have a nice simple example all called CafeTownsend (hotlink). Download it and give it a spin. Unlike NoteTag this is very easy to setup.
• Developing Flex RIAs with Cairngorm Microarchitecture – Ok for a bird-eye view

Good luck! .. as I said I’m just starting to read up on this myself, so maybe I’ll post some more as I learn