How good is the new Panasonic SLR compared to the Nikon 80?

Answer 1

Based on the previews, I think the Nikon looks better.
* The larger sensor should give you better control over depth of field (1.5 crop factor vs. 2)
* More megapixels
* Presumably a larger viewfinder
* A vast selection of lenses for every budget.
The Panasonic has some nice features like dust removal, but that doesn't tip the scale in their favor.
I'd wait for the in-depth reviews at Steve's Digicams or DPReview.
Here's the previews I mentioned:
Panasonic DMC-L1: http://www.dpreview.com/articles/panasonicdmcl1/
Nikon D80: http://www.dpreview.com/articles/nikond80/

Answer 2

Olympus and Panasonic Four Thirds System SLR cameras : development of cameras that comply with the Four Thirds System standard for interchangeable-lens-type digital SLR cameras, and will display the fruit of their labors at the PMA 2006 International Convention and Trade Show that starts today, February 26, in Orlando, Florida. Olympus will exhibit the E-330, a recently introduced digital SLR that incorporates jointly developed technologies, and Panasonic will announce development of the Panasonic Lumix DMC-L1, its first digital SLR camera. A prototype of the Panasonic Lumix DMC-L1 digital SLR will also be exhibited at the PMA 2006 Show in Orlando.

Nikon
The 80-200/2.8 is one of the joys of the Nikon system and is mandatory for any serious user. It is almost as sharp and contrasty as the Nikon prime lenses in the 80-200 range. The constant aperture makes it convenient to use with studio strobes. This is a review of the older one-touch version of the lens. The newer lens is mentioned at the end and by readers in the comment server

Answer 3

I would also choose the Nikon because so many lenses/accessories are available. I'm sure that the Panasonic has a mount that allows other lenses to be used but, will they be 100% compatible?

If you are anywhere in the world w/ a Nikon and need parts/accessories it's hardly ever a problem.