I have had a few people ask how I get this sunburst effect in my pictures. It's really a pretty simple technique. If you use a very small aperture, something like f/16 or higher usually you can create this effect.
The thing you have to be careful of is metering your exposure. If you use evaluative metering, this means the camera will take an overall average of the light in the scene to pick the exposure, the camera will usually over expose the image. When I'm trying to do this I will usually use spot metering or shoot in manual mode and then bracket the exposures.
One other thing to keep in mind is that if you are trying to do this just as the sun dips below the horizon or just as it comes up you will have very little time to get your shot. So go out and practice so you can get the technique down.
If you get some great results I'd love to see them. Post a link in the comments.