There are plenty of articles on how to get that professional lighting using all kinds of equipment that needs to be set-up, but what if all you've got is a speedlight slotted into your camera's hotshoe? Then you'll want to check out Jim Wise's article at Digital Photography School on mastering on-camera flashes.
Nicole S. Young provides us with a great quick tip over on the Photofocus blog. This is something I've been trying to do more of lately and it's worked very well.
Night photography is something we should all try as it opens up a whole new realm of techniques and challenges. You might think it takes expensive equipment or a very particular set of skills to achieve cool night time shots, but the truth is most DSLR cameras today have the ability to accomplish this with relative ease. John Paul Caponigro of Digital Photo Pro explains this process in easy to understand language. So what are you waiting for? Go out, experiment, and have fun!