#1. Screen Lens, camcorder Batteries, Image stabilization.
and #2
High-definition recording: Several models record in either the HDV or the AVCHD high-definition format. Because both 
are highly compressed, they require a very powerful computer to decode their files and a compatible video editing application to edit them. (AVCHD is a newer format; only Pinnacle Studio 11 and Corel Ulead VideoStudio 11 recognize it at this writing.) Even a powerful computer will take much more time--hours, not minutes--to render HDV or AVCHD files than standard-definition, DV-format files.
Camcorder Format: Most camcorders use the MiniDV and DVD formats, but models that capture to small onboard hard drives are becoming more common; others write to flash memory. MiniDV models still capture the best-quality video.
Wide-screen shooting: Several camcorders now allow you to shoot in the 16:9 aspect ratio used by HDTVs, even if the camcorders still shoot in standard-definition resolution. Note that some camcorders use a CCD with a native 16:9 orientation, so you get the full resolution of the CCD when you shoot in wide-screen format, whereas others use a CCD with a traditional 4:3 orientation and use only a portion of that CCD when shooting in wide-screen.
Camcorder Hard-drive models: These camcorders' main advantage is that they give you near-instant access to any footage on the drive. Rather than having to fast-forward or fast-reverse to find the scene you want, as with a tape-based camcorder, you can go to a scene by clicking on a thumbnail in the camcorder. But once the drive is full, you must stop shooting until you can offload the footage (with a MiniDV- or DVD-based model, you can just pop in another tape or disc). Also, like DVD camcorders, hard-drive models capture in MPEG format, which requires much more computing horsepower to edit; in addition, not all editing applications will accept MPEG footage.
Low-light modes: Many camcorders have the ability to film in very low light, whether with the help of an infrared light (which you can't see, but the camcorder can), a special slow-shutter mode that makes the most of ambient lighting, or built-in illumination from one or more LEDs. Some models offer all three methods. These modes can be very useful in poorly illuminated settings, but video captured with these tools enabled won't be as good as video captured in well-lit settings.
are highly compressed, they require a very powerful computer to decode their files and a compatible video editing application to edit them. (AVCHD is a newer format; only Pinnacle Studio 11 and Corel Ulead VideoStudio 11 recognize it at this writing.) Even a powerful computer will take much more time--hours, not minutes--to render HDV or AVCHD files than standard-definition, DV-format files.Camcorder Format: Most camcorders use the MiniDV and DVD formats, but models that capture to small onboard hard drives are becoming more common; others write to flash memory. MiniDV models still capture the best-quality video.
Wide-screen shooting: Several camcorders now allow you to shoot in the 16:9 aspect ratio used by HDTVs, even if the camcorders still shoot in standard-definition resolution. Note that some camcorders use a CCD with a native 16:9 orientation, so you get the full resolution of the CCD when you shoot in wide-screen format, whereas others use a CCD with a traditional 4:3 orientation and use only a portion of that CCD when shooting in wide-screen.
Camcorder Hard-drive models: These camcorders' main advantage is that they give you near-instant access to any footage on the drive. Rather than having to fast-forward or fast-reverse to find the scene you want, as with a tape-based camcorder, you can go to a scene by clicking on a thumbnail in the camcorder. But once the drive is full, you must stop shooting until you can offload the footage (with a MiniDV- or DVD-based model, you can just pop in another tape or disc). Also, like DVD camcorders, hard-drive models capture in MPEG format, which requires much more computing horsepower to edit; in addition, not all editing applications will accept MPEG footage.
Low-light modes: Many camcorders have the ability to film in very low light, whether with the help of an infrared light (which you can't see, but the camcorder can), a special slow-shutter mode that makes the most of ambient lighting, or built-in illumination from one or more LEDs. Some models offer all three methods. These modes can be very useful in poorly illuminated settings, but video captured with these tools enabled won't be as good as video captured in well-lit settings.
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