Lachie sent these notes for dealing with 16:9 exports for the web.
Open file in Quicktime,
Go to “Window -> Show Movie Properties”
Select “Video Track” then “Visual Settings” tab below
De-tick “Preserve Aspect Ratio”
Change scaled size to 427 x 240, stretches width to widescreen
/(OR change to 320 x 180, shrinks height to widescreen)
Also, a tool suggestion;
SQUARED 5 MPEG STREAMCLIP FOR MAC AND WINDOWS – quoted from the website:
high-quality video converter, player, editor for MPEG, QuickTime, transport streams, iPod. And now it is a DivX editor and encoding machine, and even a stream and YouTube downloader.
MPEG Streamclip 1.9.2 download web page
720 x 405 – 720 x 576 conversion for anamorphic