do a google search for avidemux
- perfect for little quick clip clipping.
for some reason, a direct link to the page doesn't work in this forum.
in the above shot, you can select the A and B points where you want to cut, then hit delete.
and there's an 'append', where you can add new clips to the end.
the best thing is you don't have to re-transcode again, it'll use the same codecs settings as the original. just hit the 'save video' button, so no loss of quality if you stick to the same format.
only little quirk that i've noticed is that you have to add the file extension as you save it - so you have to save as 'movie.avi', for example.