*)Stateful beans are also Persistent session beans.
*)They are designed to service business processes that span multiple method requests or transactions.
*)These beans remembers the previous requests and reponses.
*)These beans does not have pooling concept.
*)It retain their state on behave of an individual client.
*)It can be passivated and reuses them for many clients.
*)It maintain the state of the client with server
*)These beans are designed to service business process that last only for a single method call or request.
*)These beans do not remember the previous request and responses.
*)These bean instances are pooled.
*)Client specific data has to be pushed to the bean for each method invocation which
result in increase of network traffic.
*)beans beans are scaleable
*)It will not maintain the state.
For read more information :http://www.roseindia.net/javabeans/sessionbeanlifecycle.shtml