My number one choice for video editing
Professional video editors could debate the virtues of different video editing programs indefinitely, but my personal loyalty lies with Adobe Premier. Any time I need to do any video editing it is my number one choice. If you don’t need all of the advanced editing features of Adobe Premier you can purchase Premier Elements which is the scaled down version and will probably work for the majority of basic web videos you need to edit and it is MUCH cheaper.
Most popular screen recording and editing software
Camtasia is definitely the most popular screen recording and editing software available and for good reason... it is leaps and bounds better than the rest.
The PC and Mac versions are very different with the PC version offering far more features and functionality along with a significantly higher price tag.
Personally I use both versions and the Mac version is good enough for the majority of screencasts I create. The only time I switch to the PC version is when I am doing more advanced video editing or batch production.