We are still seeing a lot of 0.8.9.10 clients out there, as well as some even before then.
Just a suggestion, that all the active pools post to their miners that they should update their wallets with a notice in their top news that version 0.9.0.0-PID-beta is released.
Blak
Here are the verson's that are connected to my P2Pool!
$ catcoind getpeerinfo | grep subver
"subver" : "/P2Pool:13.412gc191dd2dirty/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.9.0/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.7/", "subver" : "/Satoshi:0.8.9.10/",
"subver" : "/Satoshi:0.8.9.10/",
The fork is in 1127 blocks, make sure you update before then!!