The British Library website has two million pages worth of nineteenth century newspapers digitised and available for searching. Disappointingly, viewing articles requires paid 24 hour or 7 day pass, unlike the equivalent (beta) service of the National Library of Australia.
The Open Library is another way to access the mind-bogglingly huge archive of full text digitised books at the Internet Archive; very neat site design and great options for refining searches.
The London Illustrated News was the world’s first illustrated weekly newspaper. This image library features a selection of woodcut illustrations from the newspaper dating from the mid-nineteenth century onwards.