Two things I want to point out:
1. Ironically, the screenshot of "the almighty page 7" is
the first post on page 7 of replies! (Well, at least the way it appears on my setting as a guest...)2. This quote from
delericho says it PERFECTLY:
Look at it like this:
As soon as your turn ends, you gain an Immediate action. You can use this at any point from then on.
If you don't use it then when your turn comes along again, that Immediate action 'matures', and can now be used either as a Swift or an Immediate action. If you don't use it now, you lose it.
Then, as soon as your turn ends (whether you used the previous Swift/Immediate or not), you gain an Immediate action. You can use this at any point from then on...
...and it was totally skipped over...
EDIT:
I just thought of a great analogy for the argument that your personal round resets after you complete your turn:
Think of each initiative count as a time zone, and your round as a day. If you and I live in different time zones,
my day doesn't reset when
your local time reaches 12a/0h, it resets when
my local time reaches 12a/0h, and vice versa. You're "awake" (i.e. taking standard/move/swift actions in some combination) for a couple hours, and then you "go to sleep" (i.e. it's no longer your turn). You "wake up in the middle of the night" (i.e. take an immediate action), but now you're tired the next day, and don't have as much energy (so you can't take your swift action), until your day resets again.