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The Michigan Mighty Mite is a very simple crystal controlled CW transmitter that uses very few parts, is easy to build, and a fun little ham radio project. Simplicity comes at a price, and that price is harmonic distortion. A low pass filter is shown that helps to dramatically reduce the distortion. This Mite is built with a 3.579MHz "color burst" crystal. Inspiration for building the Mighty Mite came from the Soldersmoke blog and podcast. More information can be found at the following links:

Lots of pages on the Michigan Mighty Mite:
http://www.lmgtfy.com/?q=michigan+mig...

Soldersmoke blog posts on the Michigan Mighty Mite:
http://soldersmoke.blogspot.com/searc...

ELSIE Filter Designer software:
http://tonnesoftware.com/elsie.html

Jim Tonne has a number of GREAT tutorial papers on his website, including a top-notch filter tutorial. See here:
http://www.tonnesoftware.com/miscella...

Toroid design page:
http://toroids.info/