I binned most of them. Except for:
Mankinds Seach For God - sold on eBay, bought by a Mr Lloyd Evans.
An old Rutherford book called Riches - sold on eBay. Even though I'd "borrowed" it from the KH library.
The Revelation book - Kept it. Still have it. It's too crazy and embaressing to ever get rid of.
Insight books - tried to donate them but nobody would take them - not even for free. One 2nd hand bookstore owner told me "Oh, Jehovah's Witness stuff? There's no interest in that."