One thing I forgot to mention in the SWX screencast is that you have to change the gateway URL in the PHP Service Browser from gateway.php to amf.php when you first start it. This setting is saved locally so that you only have to set it once.
You can change the setting in subsequent uses of the PHP Service Browser by accessing the Configuration panel using the first icon at the top-left of the application.
I do apologize for the unnecessary extra step in configuring the PHP Service Browser. It should come pre-defined with the correct URL but I have not been successful in getting the source for the PHP Service Browser from Patrick Mineault (the service browser is the one that is in Amfphp). I will keep trying and hopefully, once I have the source code, I will be able to make this change.
Worst case scenario, if I can't get the source, I will have to fork the service browser using the latest publicly available source (which is not for the latest version of the service browser in Amfphp) and lose time recreating some of the great functionality in the latest version.
I'm off to send Patrick another email... 
Hey cool stuff,
this is made for working with cakephp! Is there a cakephp plugin available yet?
rock on
Hi Fokker,
Wouter Verweirder is working on swxcakephp. I just replied to your query on Twitter too and you can hit him up there (his user name is “wouter”).
Good luck and please let me know how you get on.
I will be supporting the cakephp version as soon as we can get it incorporated into the SWX trunk.
Mmmh Wouter seems to bee off, maybe you could post the working sample as proof of concept?