The specification that you are looking for is minimum focal length.
The smaller the focal length - the wider the angle.
The smallest focal length (non DSLR) camera is 24 mm.
There are over 25 different cameras available with 24 mm focal length lenses.
In my opinion the best all around camera with 24mm focal length is not in stores yet.
It was just announced earlier this month.
The Canon S100.
It is the update to the very popular Canon S95.
In addition to having a wide angle lens, it is one of the top choices available for low light situations.
Here is a Preview:
The street price will probably be around $425.
Look for it to be in stores around the end of October.
The application would be for real estate photos in tight spaces such as bathrooms. Is there a camera that takes really wide angle shots that will allow me to more than just a narrow part of the bathroom or a wide angle shot of the exterior of a house for example. I would prefer something that is lightweight (not an SLR).