For now :
IBM has technology preview of
EJB 3 support as an extension to its websphere 6.x i think .
BEA has a technology preview of EJB 3 support in weblogic 9.2 .
Oracle has full support of EJB 3 in Oracle application server 10.1.3.1.0
Jonas has preview of EJB 3 support
Glassfish is full
Java EE 5 application server.
and the list continue.
all application servers that have a preview will have ejb 3 support(imho).