Having had my garden for about three months now, I can say that there is always something interesting to see and photograph in it. Regular visitors include many flower flies, commonest of which is the little blood red flower fly, Paragus haemorrhous, followed by Allograpta obliqua, Syritta pipiens, and a Platycheirus species. During the sunny parts of the day, there are ALWAYS flower flies.
Another group of frequent visitors are bees. Mostly, however, they are not the common honeybee; instead, they are native bees that are much more welcome, in my opinion. Native bees do not sting people unless severely provoked, and they come in a variety of shapes and sizes from tiny little, almost gnat-sized bees to lumbering fuzzy bumblebees. They are generally faster moving than honeybees, and thus more difficult to photograph, but if you focus on a popular flower and wait, you can usually catch them eventually.
Finally, there are the occasional visitors, that show up to feed on specific type of pollen. Among them are a couple of types of beetles, including dermestid beetles (shown below) that are occasional household pests, and the wedge-shaped tumbling flower beetles of the family Mordellidae.
all photos are copyright B. Brown, 2011. all rights retained