Dover Books printed an edition containing bits of Passages from the Live of a Philosopher and with Lovelace's translation and amplification of Menabrea's paper on the Analytic Engine: http://store.doverpublications.com/0486246914.html . I don't know what happened to my copy. You can get his On the Economy of Machinery and Manufactures at Gutenberg, http://www.gutenberg.org/ebooks/4238
