Jeff over at Digital Resource Review Page has posted his review of the Nikon D300.  He is quite pleased with the camera, citing low noise levels as compared to Sony’s A700 and Canon’s D40.

What I liked:

• Excellent photo quality (after some setting tweaks)
• Better high ISO performance than the 40D, A700
• Built like a brick (though see issue below)
• Live view on a stunning, ultra-sharp 3-inch LCD display
• Dust reduction system
• Dedicated AF-assist lamp (instead of flash-based like other D-SLRs)
• Very quick 51-point autofocus system
• Excellent continuous shooting mode, especially with battery grip (see below)
• Six different NEF (RAW) types to choose from
• Extensive white balance controls
• User can create Picture Controls with custom sharpness, color, tone curve settings
• D-Lighting can be used while taking pictures (instead of only in playback mode)
• Customizable menus and buttons; almost every camera function can be tweaked
• Support for remote camera control, wired or wireless, with live view option
• Lots of image enhancement features in playback mode (for a D-SLR)
• In-camera help system, great manual
• Best-in-class battery life
• Optional battery grip and wireless transmitter
• Supports UDMA CompactFlash cards
• HDMI video output
• USB 2.0 High Speed support

What I didn’t care for:

• Images are soft at default settings; camera tends to overexpose
• Battery grip (and proper battery configuration) required for 8 fps continuous shooting
• No exposure preview, live histogram, or self-timer in live view mode
• Sluggish contrast detect AF in tripod live view mode
• Continuous shooting burst rate drops to 2.5 fps when shooting 14-bit NEFs
• Flimsy door over memory card slot
• Remote capture software not included (Canon and Sony bundle theirs)
• Most expensive midrange D-SLR

Head on over to DCRP for a look.