Point and shoot cameras are very limited in capabilities.
If you want to develop photography skills and explore new possibilties get a dslr. If all you want to do is take snapshots, maybe you can get by with a point and shoot.
When buying a camera another thing to take into consideration is the crop factor of the sensor. If you want to do wide angle work a full frame would be the best, but full frame dslr cameras are spendy.
I believe the Lumix sensor has a 2.0 crop factor. This means the sensor is smaller than the Nikon, Canon, and I think the Pentax. A 2.0 crop sensor means 100mm = 200mm full frame equivelant, and also means your wide angle (say 14mm) isnt all that wide since it would = 28mm full frame. Basically multiply the focal length of any lens X2.
I think the Lumix is a 4/3m camera...four thirds. This is means it will shoot a more "square" photo than most other dslr's ( I think Olympus is also 4/3). Imo the 2/3 aspect ratio of the Nikons, Canons,and others is better for landscape etc.
The Nikons small sensor dslr's have a 1.5 crop factor, meaning to get the full frame equivelant focal length multiply lens focal length by 1.5 (still MUCH larger than point and shoot sensors as is the Lumix 2.0).
So 100mm would get the equivelant of a 150mm full frame.
On the wide end you can buy down to 10mm lens's so you could get as wide as an 15mm equivelant on a 1.5 sensor camera. I think the widest angle Ive seen for full frame cameras is a 14mm, which would = 14mm on a full frame, and 21mm on a camera with a 1.5 sensor, or 28mm on a 2.0.
Nikons have a 1.5, Canon has a 1.6, Olympus is 2.0, and I think Pentax may be 1.5, Lumix 2.0 (double check my numbers to make sure as Im typing off the top of my head). They all sell full frames also, but unless you are really making money you probably wont want to shell out $2600-8000 for a full frame Nikon or Canon.
DSLR's are a completely different animal than point and shoot cameras, and pixel count isnt everything. For example, Nikons D3 at $5000 is 12mp and is probably the best low light camera on the market among other things.
Anyway, you are looking at the $1000 lumix so I figured you could afford to look at the $1500 Nikon d7000.
Theres more lens's and accessories to available for the nikons.
I like the control layout of the Nikons, as the shutter and aperture dials are strategically places at the thumb and forefinger. On my D300s I dont have to take my eye from the viewfinder as basic info is in the viewfinder and the controls are easy to access once you remember which finger goes to which button.
myself.