btcGuild is btcGuild.com
Eligius is Eligius.st
P2Pool which website? P2Pool.in or P2Pool.org?
P2pool can be through any public node or your own personal node, they all connect together into one large pool.
Public nodes: http://p2pool-nodes.info/
http://p2pool.in/ is the main info site for setting up p2pool node yourself.
P2pool.org is a fake p2pool (as noted in the small text on bottom of the site, "not affiliated with p2pool and forrestv". They just took advantage of the name).
Elizium.name is a popular public p2pool node... And I have a public node listed in my sig.
Just a point of clarification, I believe that p2pool.org is a node in the p2pool network given the software being used, the network hash rate shown the comments from p2pool.org in the p2pool software section. The statement in their footer is just clarifying that they are not forrestv nor the home of the p2pool software - unless of course their stats etc are all fake.
There are a number of public p2pool nodes as you say.
I'm just going by the common "wisdom" that gets passed around the forums and reddit every few weeks/months:
http://www.reddit.com/r/litecoinmining/comments/1vizp3/psa_p2poolorg_is_not_the_real_p2pool/
I see posts like this all the time...
If they're a valid node, they really should re-evaluate their disclaimer. Saying they don't represent p2pool and forrestv, but are a valid node of the P2Pool network for the various coins they support would be much better than saying, "not affiliated with p2pool and forrestv" which gives a connotation of being totally separate from the rest of the P2Pool network.
It's much clearer with your p2pool.com in your sig.