If you are writing widgets for “Tiger”:http://apple.com/osx/, please… PLEASE don’t forget the AllowFullAccess (or AllowNetwork) tag in the Info.plist…
if you don’t – you won’t be able to make XMLHttpRequest calls correctly.
This took me DAYS to figure out.

Also, if you want to parse Atom feeds with responseXML, you HAVE to do getElementsByTagNameNS(“*”, “title”) – NOT just getElementsByTagName(“title”) – This also took me a VERY long time to figure out – save yourself the heartache!