Screenshots for help files?

hi

At what resolution do people take screenshots of their programs to put into help files?

I've made up a short little program and currently starting to make up a small help file into which I would like to put some screenshots of my program.

However I've been working on the program on a 17" LCD at a resolution of 1280x1024. So when I take a screenshot at this resolution and then reduce the size of the image by to 75%, it becomes very small.

So any recommendations/hints for creating screenshots?

cheers