Mocking can make code more reliable, more comprehensible and allow you to spot problems in design long before your code is deployed. Speakers will include Steve Freeman and Nat Pryce, developers of JMock and Felix Leipold of ThoughtWorks.
Time permitting there will also be a mocking dojo to allow you to get
See:
http://londongeeknights.wetpaint.co
http://upcoming.yahoo.com/event/498162/