I don't know if this should be here or in G&T, but I'll try here first.
Problem: My friends never know when I'm online. It's like when you set yourself to invisible on AIM (do people still use that?). I did check my account settings, and the box that says "Show as Online" is quite clearly marked. Still... no one can see me. Or invite me. Or... well, anything.
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You can also try: 1-800-4My-Xbox. Sometimes you get really good reps...sometimes not so much.
My NAT is open.
EDIT: Yeah, I guess I'll have to call them. Argh.