Mihai Corlan has posted an introduction to using TLF in Flex over on the Adobe Developer Connection.
Check it out here:
Using the Text Layout Framework in Flex 3.2 and AIR 1.5
“The goal of this article is to introduce you to the Text Layout Framework library for Adobe Flash Player 10 and Adobe AIR 1.5 and to demonstrate how you can use it to display rich text inside of the Flash Player 10 and Adobe AIR 1.5 runtimes. I will not cover all the possibilities of this framework, but I will give you enough of a push to help”

Seems not affect changes in build 370.
Hugely impressed by the TLF so far, but have you used TLF inside an application that has an undo-stack of its own?I’ve posted a conundrum over at:http://richardleggett.co.uk/blog/index.php/2009/02/19/text_layout_framework_followup