I do think it's nice that Launchpad visually identifies links that pop up
ajaxy windows and those that transport you somewhere else. I've certainly
gotten used to the green meme for that, and I think it's one of the
things
about Launchpad that works well.
I agree that this is a useful metaphor. It's similar to desktop apps
having an elipsis in menu items to signify a window will open. I think
know you're about to do a page load is a useful bit of information in
some cases, irrelevant in others.
I want to think about how we can do this better. If it really is
important that a user know whether they are about to do a page load then
I don't think making the link green is a strong enough identifier. It
wasn't until I joined the Launchpad team and read a bug about the colour
of the green links that I discovered what a green link meant.
It is possible that we could use buttons, or place an icon with the link
instead of colouring the link. I'm sure there are more options.