As a medium for help, support and so on, it can be very helpful, but again, since IRCs are not archived,
Though they can be archived: http://ginandtonic.org/wicket
not searchable,
in a searchable fashion: http://woogle.billen.dk
there is no 'knowledgebase' being built up, and you will end up answering many questions over and over again.
Nothing beats the mailing list. Except for a well maintained WIKI maybe.
/me ducks
/me digs a hole for the winter ;) Eelco