Taking better digital photography involves more than just having a camera with a bunch of megapixels, although you wouldn't know that listening to digital camera salespeople. Using a tripod, being able to manually set the white-balance control, and having pre-programmed modes to aid in tricky lighting situations are all important factors in achieving better digital photography. There is one specific area where more megapixels will create better digital photography results. If everything else is the same, more megapixels will provide GREATER FLEXIBILITY TO CROP A PHOTOGRAPH and still wind up with a sharp clear photo.
After taking many digital photos in quick succession, the camera may need to pause while it processes the images. Lag in point-and-shoot digital cameras is something the manufacturers are working very hard on. The good news is that, in most current digital point-and-shoot cameras, lag is now reduced significantly. While probably not something you want to use for sports photography, a current, quality, point-and-shoot digital camera acts very similar to a film point-and-shoot camera.
To summarize, I suggest that almost anybody will be happy with a camera with a six megapixel resolution. If you're really on a budget you can go down as low as five megapixels and still have detailed pictures at the sizes you're most likely to have prints made. If you're an advanced shooter or hobbyist you'll enjoy the extra room that an eight megapixel camera will give you. If you're a professional, you need a camera resolution appropriate to the job at hand.
To manage an increased ISO, or during very long exposures, the camera must send more power to the sensor, which results in the appearance of small specks or dots of white or color. Most of the noise will generally manifest itself in the darker areas of your image. This is an important point to pay attention to if your photography requires higher ISO settings, nighttime or long exposures. In higher end cameras, manufacturers have spent the money to reduce the noise problem, but it still may present itself on the lower cost models.
The digital single lens reflex really comes into its own in any type of action photography. The digital single lens reflex has comparatively no lag from the time you press the shutter button and when the photographs are taken. Because the viewfinder is optical, you are actually seeing the present and not the slightly delayed past in a preview screen. This does mean, however, that you cannot compose the picture through the preview screen.
Serial ports are just about extinct at this point due to their slow connection speeds and lack of plug-and-play support, but some older or lower-end models may still offer serial connectivity. USB may be the most common form of connectivity, and if speed is important to you, look specifically for USB 2. Some specialized cameras may take advantage of the high speed Firewire protocol for connecting to a computer. Just about all modern computers come with at least a pair of USB ports, but not all computers include Firewire.
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