I have been testing the two main alternative viewers to the SL client- Snowglobe (open source) and Emerald.
Although Emerald is prone to crashing (especially when you take about 50 high resolution shots like I do in a short period of time), it gives many more options for photography, is feature rich, and makes for a clearer image.
At the Shampoo party on Thursday night, I photographed Sebastian String and notices that his shorts looked fuzzy. I thought there was something wrong with the texture used on his shorts.
He then showed me photos he took which showed the same shorts in perfect clarity.
I relogged with Snowglobe, cleared my cache, and hoped for an improvement. There was none.
I then relogged with Emerald and took this picture of him:
Look at how more clear his shorts look. He has nice legs too, doesn't he? I am going to continue to test but for now Emerald is my preferred viewer.