Writing description is always a struggle for me. I love dialogue and often get caught up in my character's conversation and forget to move them about the page as they're talking. In my head I can picture rooms but they tend to not show up on the page as my characters walk through them. If you have a similar problem you might want to check out these links.
Two links at Cat Rambo's blog, yes she's a sci-fi writer, but I can't think of a better place to learn about description than from a fantasy or sci-fi writer.
And over at Storytellers Unplugged http://www.storytellersunplugged.com/ Thomas Sullivan has a beautiful essay that both shows and tells you how to do it. And you've got to love a title like this, "Writing With Coyote Pee, The Walter Mitty Shuffle and Metaphor Multi-Tasking"