This is a very well designed tool, and it it works great. It offers the option to load at Windows at startup and for the canvas to be activated via a keyboard short cut. It's very easy to use, and there is no need to read any documentation. It just works they way one would expect.

I would recommend the following improvements to make this tool even better:
- Add an option to automatically open a save dialog after capturing a frame if the users prefers that over just copying the fame to the clipboard and then having to select to save the image.
- Add a second keyboard short cut to capture the entire screen (and depending on the selection for the option above, to open a save dialog after capturing the screen).
- Offer an option to save the frame in a lossless format (i.e. TIFF or BMP) aside from JPEG. This is important for situation where one would want a pixel-accurate copy of what's on screen.

Keep up the good work! I wish more programmers would publish their tools as freeware. I have seen shareware and even commercial screen capture tools that don't work as well as PixClip.