I would hope it would be easy to show prior art, but stuff like this (http://m.theregister.co.uk/2011/04/21/texas_jury_says_google...) is where it becomes "hard" to prove prior art. Because you have to prove it against a jury of, generally, non-technical people. Here is the primary claim:
* a linked list to store and provide access to records stored in a memory of the system, at least some of the records automatically expiring
a record search means utilizing a search key to access the linked list
the record search means including a means for identifying and removing at least some of the expired ones of the records from the linked list when the linked list is accessed
* a means – utilizing the record search means – for accessing the linked list and, at the same time, removing at least some of the expired ones of the records in the linked list
* a linked list to store and provide access to records stored in a memory of the system, at least some of the records automatically expiring
a record search means utilizing a search key to access the linked list
the record search means including a means for identifying and removing at least some of the expired ones of the records from the linked list when the linked list is accessed
* a means – utilizing the record search means – for accessing the linked list and, at the same time, removing at least some of the expired ones of the records in the linked list