It might be the wrong impression, but it seems that a new wave of semi-compact cameras hits the market, targeting enthusiastic amateur photographers. These cameras are relatively small in size, but focus on high image quality. One of the first camera was the Panasonic Lumix DMC-LX3, which I did not like too much. In the following chart I’ll compare the sizes of four types of cameras:

• Point and shoot with relatively small sensor size (1/1.7"): The Canon PowerShot S90, Canon PowerShot G11 and Panasonic Lumix DMC-LX3.
• Compact cameras with fixed lens but larger (like APS-C size) sensor: The Sigma DP2 and Leica X1.
• Compact cameras with full-frame or µ4:3 sized sensor and interchangeable lenses: The Panasonic DMC-GF1 and Leica M9.
• DSLRs (full-frame and APS-C size): Nikon D3000 (the smallest Nikon DSLR), Nikon D90, Nikon D300s (the latest, most professional crop-sensor DSLR by Nikon), Nikon D70s (my current camera) and Nikon D700 (full-frame).

Click on the image for full-sized version.

Please note: the chart shows the outer bounds of the camera; of course, cameras are not cubic blocks, but have an non-rectangular shape. That can make a huge difference in the “percieved size” of a camera. Additionally, for all cameras with interchangeable lenses (Nikon DSLRs, Leica M9 and Panasonic Lumix DMC-GF1) I show body sizes only. Lenses will increase the size significantly.

[Update] I added sensor sizes to the chart. You can view and download the PDF.