I think this is significant particularly to real estate photographers because exposure fusion, I find, can give most of the benefits of HDR processing in a faster work flow. Sure, you can probably do better if you spend some time with tone mapping but you need to remember that Realtors are not willing to pay for fine art. As M. James says, "real estate imaging is about quick and good - some times not perfect".
My prediction is that exposure fusion is going to be built-in to most DSLRs real soon now. In fact, the "Multiple Exposure" feature that the Nikon D300 has, that combines up to 10 consecutive exposures, sounds to me a lot like exposure fusion. Exposure fusion along with big ISO numbers like the Nikon D3 can do is going to revolutionize real estate photography in the near future. Come on Canon, I'm waiting!
Update 4/8/08: In the comments below David Palermo points out an interesting article titled "Photomatix 3: Exposure Blending or HDR" by Uwe Steinmueller over at digitaloutbackphoto.com. Uwe goes into the pros and cons of Exposure Blending and HDR and comes to the same conclusion that I do. David also correctly points out that I don't know for sure that Photomatix 3 is using Exposure Fusion in their function called "Highlights & Shadows - Adjust". It's a wild guess on my part that they are.