Originally posted by Shrike
Yes, I've read them all. And CP is very related to the Culture..... it mostly happens on an O. 
And the Culture versus the Photino Birds would be interesting, to say the least......... The Xeelee have a massive empire, but in one on one, are the Culture's *****es - going by what I've seen so far. (Vaccum Diagrams - the other two Xeeleeverse books I've read were Flux and Raft (?) which had little to do with the Xeelee)
Ring is the last Xeelee novel, chronologicly. The list, as of its writing is:
"The Sun Person"
"The Logic Pool"
Timelike Infinity"Cilia of Gold"
"Lieserl"
"Chiron"
"The Xeelee Flower"
"More Than Time or Distance"
"Blue Shift"
""The Quagma Datum"
"Planck Zero"
"Vacuum Diagrams"
"The Godel Sunflowers"
"The Tyranny of HEaven"
"Hero"
FluxRaftRing(quoted titles are short stories, bolded are novels)
Raft takes place in an alternate hi-gravity universe, and is referenced in one chapter of Ring. Flux describes the neutron star colonization experiment mentioned in Ring a few chapters later.
I don't know how Joe Xeelee stacks up against an average guy from the Culture, but I do know I wouldn't bet against the Xeelee. Remember, they built a navel for the universe. They gave up on matter as a building material and started pulling spacetime and higher, rolled-up dimensions about themselves to build fighter craft. They're kind of buff.
Now, I've heard about the Culture books. Can you tell me more about them, because I've never even seen one.
Flux
The Timeships
Raft