Darren Addy
EF5
DxOMark-Sensor
is one of the coolest little things I've seen for a while. It is a useful way to see real differences between a manufacturer's different models and how yours stacks up to other manufacturers in the same price range (or same sensor size, or same price range). See if you REALLY need to upgrade your camera, based upon the IQ criteria that you find important.
Note that this is NOT an overall Camera Buying Tool, but concentrates only on comparing the Image Quality of the RAW images produced. There are other features that may be important to you (For example, Frames Per Second, if you shoot a lot of sports/action, etc.) I recommend reading this MeFi thread to catch up on what Dx0Mark-Sensor is and is not. If you are anything like me you can spend a lot of time with this data.
The DxoMark site has a lot of other cool and informative information, such as: a multi-page article on the Three metrics constitute the DxOMark Sensor scale, how they Normalize the Data (to compare apples and oranges), Analyze your Camera OR Compare two cameras, and an article that suggests that Contrary to conventional wisdom, higher resolution actually compensates for noise.
Enjoy!
is one of the coolest little things I've seen for a while. It is a useful way to see real differences between a manufacturer's different models and how yours stacks up to other manufacturers in the same price range (or same sensor size, or same price range). See if you REALLY need to upgrade your camera, based upon the IQ criteria that you find important.
Note that this is NOT an overall Camera Buying Tool, but concentrates only on comparing the Image Quality of the RAW images produced. There are other features that may be important to you (For example, Frames Per Second, if you shoot a lot of sports/action, etc.) I recommend reading this MeFi thread to catch up on what Dx0Mark-Sensor is and is not. If you are anything like me you can spend a lot of time with this data.
The DxoMark site has a lot of other cool and informative information, such as: a multi-page article on the Three metrics constitute the DxOMark Sensor scale, how they Normalize the Data (to compare apples and oranges), Analyze your Camera OR Compare two cameras, and an article that suggests that Contrary to conventional wisdom, higher resolution actually compensates for noise.
Enjoy!
Get out there and shoot! Make beautiful images!! 
I use lenses that most folks would consider low quality (i.e. non L), but that work very well when used correctly. My first camera was a Sony F707, and it took amazing pictures if used properly. My Canon 10D still takes cleaner ISO 100 images than most of the newer "low noise" sensors.
