I just saw this one on Fine Gardening's site. I was blown away, I had no idea there were orange ones, stunning.
Maybe it was this one?

Here is a link that might be useful: orange rhodo

There are a number of orange deciduous azaleas such as the one in the Fine Gardening photo. If the original inquiry is about a broadleaved evergreen rhododendron, there are not very many. Going to the website of the North American Rhododendron Society -NARS- and searching under "orange" in the color category may yield the name of the variety. Photographs are not, however, always very accurate in the depiction of colors.

I love orange too, and I have a number of orange rhodos, though not all of them have bloomed yet; they'req quite new and small. One is called Medusa; I'd have to dig a bit for some other names. Did the plant have tight trusses, or were the flowers more loosely distributed?

There are also some that are more into copper/yellow/peach, sometimes changing through their bloom season, for instance, Nancy Evans. Old Copper is another orange that may be fairly common. Flipping through the rhodo book by Greer (a book I love to hate because it's hard to answer questions like this), I see others such as September Song, and on the orange page he shows only a couple I would deem really orange: Whitney Orange , Dodp. amd Fabia Tangerine.

KarinL

The most common orange deciduous azalea is Gibraltar (-15F):
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An extremely hardy orange decidous azaleas is Mandarin Lights (-35F):
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A good East Cost native diciduous azalea that has some orange clones is R. calendulaceum (-20F)
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Orange rhododendrons are usually fairly tender. I haven't seen many here in Pennsylvania. They are quite common on the West Coast. Here are some orange big-leaf (elepidote) rhododendrons:

Apricot Nectar (-5F)
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Donna Hardgrove (-5F)
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Mary Belle (-15F) probably the hardiest orange rhododendron and is found in the East.
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Old Copper (-5F)
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Viscy (-10F)
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I have Whitney's Orange. The picture I took looks more red than orange, even though it is an orange color to my eye. I'll post a picture when I get back from vacation.
Mike

There are a number of orange rhododendrons in the tropical vireya listings like Mt. Pire