|Taking fisheye effect pictures|
The fisheye effect is... "is a wide-angle lens that takes in an extremely wide, hemispherical image." Wikipedia.- from yahoo answers.
Cheap, low quality fisheye adaptor on a DSLRs kit lens - http://www.flickr.com/photos/martin-spoo…
It isn't so common on digital cameras as the crop factor with digital sensors rules out extreme wide angles. You need a full frame sensor that replicates 35mm film properly to get the proper effect. Cheap adaptors are just that, cheap. The results are cheap.
You can't do fisheye with a compact camera.
You could warp your pictures in software, obtaining a faux fisheye effect. We can tell that's what you've done though as it's obvious and not good.