The PureMVC framework is considered one of the best for Flash/Flex development (definitely the best documented), I hadn’t checked out the site in a while (which has undergone an overhaul and is much improved!) and since my last visit PureMVC is now available for not only AS2 and AS3 but C#, ColdFusion, Java, Perl, PHP, Python, and Ruby as well.
I should say plans for Ruby as they are looking for a project owner to work on the port. I’d volunteer myself (famous last words) but while I love Ruby I don’t know the ins and outs of the language as well as I do ActionScript.
In any case having one framework “to rule them all” would be a great boost to productivity as you wouldn’t have to mentally switch gears between the front (Flash/Flex) and back (PHP/Ruby etc.) ends.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.