It doesn't even say I'm online? Then how do some people know to send me invites right when I get on...
I did set it to "show offine" on xbox.com, because I'd check the site and then people would always think I logged on XBL and instantly went invisible or something. But I'm not sure if that also applies to actually being on XBL, because when I checked the preferences for showing up online / away / busy / etc it always was set to online.