As there is a lot of information available about this plant on various websites I will just list most of the uses in a very edited form and you can find links to the various websites available. I like to specially mention the Eatweeds website by Robin Harford giving much interesting information about Elder and many other so called weeds!
I use colour coding for easy reading! Blue background is general interesting info (although I hope you find it all interesting!!). Green is about all the uses except for medicinal uses or if there is a warning in which case I use a pink background. Pictures and the poem on the end by Matt Summers.