I'm new to SilverStripe and I was told that the underlying framework supports AMF.
Are there any examples or quick walk-throughs out there that could help me having a flex application as the frontend?
I am still going back and forth between Symfony with Sympal and SilverStripe. If it is rather easy to have a Flex frontend in SilverStripe I would go for it.
No, sapphire doesn't support AMF (at least not the 2.3.3 release and I don't think it's on the roadmap). I usually use XML to deliver content for flash sites. If you're thinking about a flash (flex) backend, you would look at a lot of work I'm afraid.
Maybe you also want to have a look at the Zend Framework? They have a good AMF server implementation.
Sorry, I re-read your post. You're clearly talking about front-end, not backend. You should be fine using XML (unless you're building a web-application with SilverStripe/Flex?). I just recently completed a flash site (http://bold-werbung.ch/) with SilverStripe as backend. If you need some pointers how to do this, feel free to ask.
Humm... well at the end I will then probably go for Symfony.
Sorry I wrote the reply after I read your recent reply.
Can you post an example of the Flash frontend?
<shameless self promotion>
The upcoming SilverStripe book has a 15 page recipe on creating a Flash frontend driven by SilverStripe CMS (via RestfulServer and custom XML output) ;)
</shameless self promotion>
We've done SilverStripe integration with AMFPHP before, so its possible - although I don't know much about the details.