One bug in Daylife's API tester's javascript. It just never worked in IE for some stupid reason. The solution was surprisingly simple.

After some analysis with firebug, I just figured out that the variable's value wasn't being preserved after a particular point. So I just had to take it's value and assign it back to itself.

It's in this file: http://demos.daylife.com/api_tester/js/daylife.tester.js (lines prefixed with comments "IE Fix")

[Full disclosure: I was not and I'm not a part of Daylife. I only participated in a contest they once conducted and was asked to try solving their problem by one of their staff.]