I have really fallen in love with viburnums over the years. It all started when we bought our home in 2004 and there was planted a Shoshoni Doublefile Viburnum. The shrub started out small, planted between a peach tree and a royal star magnolia. With a little bit of compost each year, it has now completely outgrown it's expected size range and has overtaken the space. I've trained it to be a small tree rather than a shrub. I love the shade it offers the shade-loving perennials under it. Each year it grows bigger and bigger! This next year, I need to consider pulling or transplanting the two trees on either side of it.
Another favorite of mine is the Eastern Snowball. I just love the happy, white snowballs that blossom this time of year. They remind me of cheerleaders! One feature that I love about this variety are the generous blossoms they give. Even the smaller, younger shrubs produce lots of blooms. I have a few smaller shrubs growing around my garden and they each bloom every year. I love the way the snowball blossoms look in a vase or in an arrangement.
A few other varieties that I have growing in my garden that I love are Korean Spice, Burkwood, Pink Dawn, and Diana Koreanspice. They are all so hardy, add great color throughout the seasons, and some of them smell so wonderful. Here's a great link that explains more about viburnums. If can't say enough about viburnums!