With the burst of mirrorless interchangeable lens cameras, we've modified the enthusiast SLR category to include all interchangeable lens cameras, and added a new "street" for smaller, more discrete cameras made possible by the mirrorless systems.
Top Studio Camera: Nikon D3X
Top Safari/Sport Camera: Canon EOS 1D Mark IV
Top Street Interchangeable Lens Camera: Leica M9
Top Enthusiast Interchangeable Lens Camera: Canon EOS 7D
Top Entry-level Mirrorless Camera: Panasonic Lumix DMC-GF1
Top Entry-level SLR: Nikon D3000
Top Non-interchangeable lens Camera: Leica X1
Top Compact Camera: Canon PowerShot G11 (or G10)
Top Ultracompact Camera: Canon PowerShot SD940 IS
Nikon D3X: Top studio camera
The Nikon D3X has a higher resolution sensor, and the flexibility to shoot with a 1.5x crop to get a higher frame rate. Otherwise, the D3X and last year's winning Canon EOS 1Ds Mark III are quite similar performers.
Canon EOS 1D Mark IV: Top safari/sports camera
The Canon EOS 1D Mark IV nudged past the Nikon D3 to regain its crown. There is not a lot separating these two cameras, but slightly faster, slightly higher resolution, and slightly better noise (and calibrated ISO 12800) were enough to put Canon back on top.
Leica M9: Top street interchangeable lens camera
Leica is the quintessential street camera. While there are smaller mirrorless cameras made possible with modern technology, for now the Leica M9's resolution and quality—not to mention legendary lenses—wins this category.
Canon EOS 7D: Top enthusiast interchangeable lens camera
After creating the enthusiast digital SLR market and dominating it for the better part of a decade, Canon's line seemed to lose focus. The enthusiast EOS X0D line seemed to stagnate and felt more entry-level just as Nikon's DX00 line got weathersealing and began to feel like mini-pro cameras. The EOS 7D is a return to an enthusiast focus, with improved autofocus, environmental sealing, and 8fps bursts.
Panasonic Lumix DMC-GF1: Top entry-level mirrorless camera
The Panasonic Lumix DMC-GF1 is a small and compact mirrorless camera, and the kit pancake lens is surprisingly good.
Nikon D3000: Top entry-level SLR
Enthusiasts should stay away—if looking for a deal, get one of last year's higher-level models—but for a novice user who feels overwhelmed, Nikon designed the D3000 for you. If you need a little bit of hand-holding while out and shooting, the D3000's on-board guides will come in handy.
Leica X1: Top non-interchangeable lens camera
The Leica X1 is not the first NILC to sport an APS-C sized sensor (the much larger Sony Cyber-shot DSC-R1 was), but it is the first Leica to do so for "only" $2,000. The Leica X1 is designed for the Henri Cartier-Bresson in anyone (with the money to spend), and the 35mm-equivalent f/2.8 lens compresses when off to fit inside a jacket pocket. The dial-based exposure settings give the feeling of simplicity on the X1.
Canon PowerShot G11 (or G10): Top compact camera
If there were any sign that the megapixel race is over, it is that Canon noticed they dropped something and started running backwards. While the PowerShot G10 (last year's winner) had a 15MP sensor, this years update, the PowerShot G11 has only a 10MP sensor (otherwise, they're pretty similar cameras). The reduced nominal resolution means that each photosite on the sensor is larger, and can capture more light, and at the upper end of the G10's range (ISO 1600) the benefits of the G11 are clear. If you plan to never shoot outside of daylight, and not test the G11's ISO 3200, the G10 will still give better resolution at ISO 200; but is that really practical?
Canon PowerShot SD940 IS: Top ultracompact camera
The Canon PowerShot SD940 IS has a 12MP sensor and Canon's latest Digic4 processor behind a 28-112mm (equiv) zoom lens. If you would rather have a little bit more zoom range and flash power at the cost of a little bit bigger body, the SD980 IS has a 24-110mm (equiv) range.