IOS – Under what cases will I get iWork or iLife

After looking at various models of Macs and looking at Apple's iLife and iWork pages, I'm more confused than where I started.

Originally, I thought that nothing – just Lion – came with a new Mac. But then I saw something here that says that iLife is a part of every new Mac.

So I thought. But then I saw this that said that iLife is not a part of Lion. Huh? Then, to add to my confusion, I saw this, that said that iWork does not come with a new Mac. Hmm. So after doing some research, I've arrived at these conclusions:

• Apple really needs a central place to see what comes with a new Mac and what doesn't.
• iWork is seperate from iLife, but both can be bought from the Mac App Store.
• iLife comes with Lion.
• Nothing comes with iOS.
• I'm really confused.

So: Under what cases would I get iWork or iLife?

[example answer] You get iWork if you buy XYZ and iLife if you buy ABC. Both come on the Mac Pro, and none are on the iPad by default; however you can get iOS versions through the App Store for $41.34 each. You can buy them for $700 each on the MAS. The MacBook Air comes with iLife but not iWork; so does the MacBook Pro.