Some Advent resources:

Advent music widget (Concord Pastor)

Loyola Press' Advent retreat:

Online Advent Experience

OSV's Daily Take's Advent wake-up call links to some great reading as well.
Fran at There Will Be Bread's recommendations for Advent on the web 
Jim McDermott SJ's Advent series at Gone Walkabout starts here.
Fran and St. Edward's Advent reflection series starts here.
Robin at Praying Advent through Darkness is reflecting on the season as one who mourns.
Philadelphia Catholic Standard & Times Advent series (my reflections are here).

Previous posts here on Advent themes:

Where your strength lies
Extravagant unbusyness consider indulging not in frantic excess, but in stillness
Bound up in waiting waiting changes us
Poor gifts the poverty of spirit that marks Mary's gift to us, and our own lives
Open wide your doors:  The O Antiphons