Several times this month I've found www.xmpp.org/, the organization responsible for the Jabber protocol and it's many extensions, non-responsive. Their site has been down for at least 7 hours tonight, the longest yet (to my knowledge).
For our purposes I'll be mirroring their XEP's on pysoy.org as soon as they're back up. It's seriously frustrating to be working on this when the documents you need are often unavailable.
If anyone knows of an existing mirror we could use, please reply to this posting.