Del.icio.us ued to have a 'beta' feature that posted your new links from that service as a WP post daily.
With the name change to delicious.com, the whole 'posting from delicious' is not working for me anymore, delicious are looking into it, but say they will eventually go in the direction of using external plugins for the service, such as Postalicious.
Any chane we could have Postalicious implemented in wordpress.com?
Some additional info here:
And the plugin author's page: http://neop.gbtopia.com/?p=108