This Friday, I am going to be releasing a new set of presets for Lightroom 3 JPEG that will be similar to my Light Leak set for Photoshop. My Light Leaks have been my most popular set, by far, so I thought it would be fun to create a similar set for Lightroom users. In the meantime, I am offering a free download of one of the presets (the set will have 15 total). Here is a before/after so you can get a feel for how the preset works:
Also, this preset can be applied to a RAW file, but you will need to up your Exposure, Brightness/Contrast to get the same look.