Did Darwin plagiarize?

The Australian writes:

One group of critics has commissioned computer experts with specialised anti-plagiarism software to scour Darwin's book, published in 1859, for similarities to a paper released the year before by Alfred Russel Wallace, a naturalist who worked for eight years in what he termed the Malay Archipelago - primarily Indonesia and Malaysia.

Initial indications are that the analysis will show some of the most important ideas in On the Origin of Species were taken from Wallace -- in particular the idea that species with variations helping them to survive would thrive and pass on these features to their offspring.