Hi Taufix,
It seems the question you are referring to is on our old Q&A system and your question can be found at the link below where Rand answered it today.
http://www.seomoz.org/qa/view/52213
I've copied and pasted his answer below for you. Feel free to respond in either the new or old system and check out the blog post where we talk about the release of our new Q&A system.
http://www.seomoz.org/blog/new-pro-qa
Hi Chowi - so sorry for our long delay! We've been launching the new Q+A and got a bit backlogged. Hopefully I can be of help.
#1 - There's a few SEO issues, but what you're doing can/should potentially work. The problems are:
A) Users who link to / tweet / share / email content around will likely get the Flash version(s) and may not be sharing internal content/pages (or linking to the correct URLs for the mobile/HTML/search-friendly version). That sucks, but if you're more concerned with just being indexed/crawled and not competitive rankings, it's less of an issue.
B) If the engines are crawling inside the Flash (via SWFObject or some othe engine-readable format), it could mean duplicate content.
C) In an ideal world, I might think about HTML 5, which allows for Flash-like interfaces while being SEO/Mobile friendly and device agnostic.
#2 - That redirect should be fine - it's what lots of Flash sites do and the engines shouldn't have a problem. The nasty bit, of course, is that users linking/sharing the Flash URL likely won't be crawled/parsed properly by Google, which bites.
#3 - As I mentioned, HTML 5 could be a quite nice solution, or even mixing HTML and Flash such that the URLs have Flash on them, but aren't "all Flash" so the URLs map properly, etc. These aren't prefect solutions, of course, but they're possibilities. One more thing - you might want to look into Google's new AJAX crawling, which could apply depending on how you build your app. http://code.google.com/web/ajaxcrawling/
All the best!
Rand