10 of 11 people found the following review helpful
An excellent Kindle edition,
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This review is from: The Sonnets (Kindle Edition)
Although not free, this edition (April 2009) costs less than £1.00 and does all the things you want it to. It has a contents page with an index of first lines, which allows you to link quickly to the sonnet you want. Judging by the reviews concerning the formatting of of the free March 2011 edition this one's probably a better bet.