Dark Elf releases since their last book have been:

August 2008: Dark Elves (7th edition)
Dark Elves - Corsairs
Dark Elves - Cold One Knights
Dark Elves - Dreadlord
Dark Elves - Mounted Dreadlord
Dark Elves - Sorceress
Dark Elves - Mounted Sorceress
Dark Elves - Assassins (3)
Dark Elves - Hydra
Dark Elves - Lokhir Fellheart

January 2009
Dark Elves - Dreadlords (3)
Dark Elves - Mounted Dreadlord

July 2011: Storm of Magic
Dark Elves - Lord/Sorceress on Dragon
Dark Elves - Sorceress

So, two unit kits, two big monsters (one plastic) and a range of characters.