Whizbang Dustyboots
Gnometown Hero
Worst case scenario, you can sell them to NobleKnight.com, which offers (IME) very fair prices on older stuff and take store credit and get 5E stuff instead. But like everyone said, nearly all of that stuff has at least some value in subsequent games -- I used older edition stuff in 3E all the time and use it even more now that I'm playing Castles & Crusades -- so anything you truly love, I would recommend keeping.