If you're looking for information and pictures of ferns, check out Ferns and Lycophytes of the World. This site is a great repository of information about ferns and lycophytes, and serves as a "digital herbarium", connecting collection information with keys, floras, photos, and more. Contributors to the site include a number of fern and lycophyte experts based all over the world, and you can sign up to contribute yourself if you're interested.