In no particular order…

• The layout channel detail page is borked when viewed with Firefox; it is fine in Chrome and IE.
• There is currently no way to completely delete a channel.  It is possible to remove a channel from a frame but nothing that allows removing it from the system entirely.
• There seems to be some confusion on how to get a channel onto a frame.  Clearly some UI and workflow work needs to be done in this area.

More later — thanks for testing and reporting!