I discovered this plant recently. From the acorns, it's obviously an oak of some sort. It appears to be evergreen. The plant is only about 1 meter tall, but I'm not sure if that is it's natural growth, or if it was cut back at some time. As you can see from the images, both the leaves and acorns are very small. This plant is growing in Seattle, and appears to have been there for quite a while, so it must be relatively hardy. I'm guessing that this is a Quercus vaccinifolia (Huckleberry oak), but I'm not sure.
Very cool - I didn't know there was such a thing! There's a good photograph in Kruckeberg's "Gardening with Native Plants of the Pacific Northwest" on page 105 - that book should be at your local library. As for identification, assuming this is a western North American oak, I don't think it could be anything else.
According to Flora N America it only gets up to southwest Oregon: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501093 So presumably planted in Seattle, not native.
