After being down for 24 hours on Monday, users of Xbox Live went without the service again for 4 hours late Tuesday night and into early Wednesday morning. PWN or DIE kept up with Major Nelson and the Xbox Live support updates until service was restored.
Update#2: 12:53pm (cst) We are noticing the problems again and it is not just us. The Xbox Live Support site has the image above back on their site. Major Nelson has addressed this again via Twitter:
No, you're not crazy. LIVE is having a few issues right now. I am working on getting an update
Xbox.com/support is being updated as we move through this issue.