If you already own Lightroom and have used it in the last few days it will have automatically asked to be updated to version 1.1. Version 1.1 is free and has some pretty nice features. The two I like the best are sharpening, noise removal and clarity. Uwe Steinmueller over at outbackphoto.com has one of the best summaries of the new features I've run across.
Sharpening now works much like Photoshop CS3 in the area of sharpening. Clarity is a awesome new feature in Camera RAW 4.1 that Lightroom and PS CS3 now use, that allows you to improve the local contrast and detail in an image. On the images that I've used it on the effects are quite striking. I like it!
The significance for RE photography work flow is that there are now only two features missing from Lightroom that prevent it from being the only software a real estate photographer will need. Those features are perspective and lens distortion correction. It seems very likely that these are features that will be added to Lightroom in the future. But to it wouldn't hurt to let Adobe developers know what you think by giving them input on the Lightroom User Forum.