A few useful links that may prove helpful.
The North-Western Tasmanian Lilium Society Inc. has a website with lots of useful Lilium-related information on http://liliestasmania.com.au.camlilies.com.au/
The Royal Horticultural Society Lily Group is another excellent source in the UK on http://www.rhslilygroup.org
I the USA & Canada, the North American Lily Society (NALS) is another useful link on http://www.lilies.org