It depends...
You have to look at a lot of things, but a lot depends on how critical you are. Many superzooms fit the bill, but do you want to be able to shoot in low light? That isn't their forte. Do you want focus tracking for moving subjects like wildlife (Think DSLR), do you want to change lenses for specialized scenarios? Think Macro, astronomy, or attaching to a microscope.
A good place to look is
www.dpreview.com I have this camera, and I like it, but it struggles with lightning photography which I like.
http://www.dpreview.com/products/panasonic/slrs/panasonic_dmcgh3It is an interchangeable lens system, small, fantastic video, etc. The 100-300mm lens plus body is 1/2 the size, 1/3 the weight of a low-end cannon dSLR plus zoom lens. There are better bodies available now with much better performance. Some pictures I have shared here were taken with this camera if not my Cell phone.
A good superzoom is this:
http://www.dpreview.com/products/panasonic/compacts/panasonic_dmclz40 which is a do-anything camera, at the sacrifice of poor low-light performance and inability to isolate subjects with focus. These also tend not to be very rugged, and don't have any weather sealing. Typically considered disposable when they break.
That leads me to another question, do you want weather sealing? This limits your selection to either a rugged camera, or high-end interchangeable lens cameras.
More info needed, and we can help.
-Mark
