There is a new app for N900 floating around to get the best out of your camera:

BlessN900

with BlessN900 you can do better pictures:

• - More light, less blur
• - Zoom you will want to use
• - High dynamic range - no clipping in highlights and shadows
•  

Digital zoom is one of the worst digital things ever invented. In fact, it is not a real zoom, just a quick and rough stretching of the center area of an image. You would not use it if you wished to get an image of any quality. So, should you still have a generic camera with optical zoom in addition to your mobile phone? No. BlessN900 implements unique SuperZoom technology, providing digital zoom quality close to one a generic optical zoom would provide.

• 1. Half-press the camera key to focus on the scene.
• 2. Press the camera key to take the image.
• 3. After taking the image you get a preview in about a second, then the image is processed before placing it into the Album. The Album icon shows if the processing is in progress and how many images are being processed. After the processing is complete (it takes about 8 seconds per image), the photo is available in the Album

there are known issues, too: 

As BlessN900 is a complete software implementation of Blurless and SuperZoom technologies, it takes some time to process the image. Processed image appears in the Album in about 8 seconds from taking it. A hardware implementation would remove that delay.

this app is still under development. it's currently available in version 0.25-1.

[blurless feature test]

if you want to download it, look here or download it with your app manager on N900 from the Maemo Extras-Devel repository directly.

source: blessn900.com