Flassari.is

If your IIS server throws a “404 not found” page every time you try to fetch a flash video file (flv or f4v), your server might be missing the MIME type declaration.
In the Internet Information Services Manager, right click the local computer server and select Properties, open MIME types, click New and enter the following for flv (technote):

Associated Extension box: .FLV
MIME Type box: flv-application/octet-stream

and for f4v (technote):

Associated Extension box: .F4V
MIME Type box: video/mp4

Digging around the internet, I’ve found people reporting these MIME types working too;
video/x-flv for .flv files, and
video/f4v for .f4v files.

Be advised that you may have to restart IIS for the changes to work.

I’m working on a big project and was having some problems with memory leaks. After some google-ing around I found this great video on AdobeTV by Jun Heider where he shows you how to profile both the memory and performance of your AS3 or Flex application.
It’s pretty thorough and it is little over one hour in length.