I know you know /g/ .. teach me your deep, dark ways!
Not sure how many of these still work, but have fun:
http://hg5km4y37lgir6r3.onion --Blow commercial jets out of the sky with rockets
http://kpvz7kpmcmne52qf.onion/wiki/index.php/Main_Page --Uncensored Hidden Wiki
http://zqiirytam276uogb.onion --Thorlauta (Finnish chan)
http://2i7aalqdpiuw36nu.onion --Sipulikanava (Finnish chan)
http://fbichanc6yfagl4l.onion --FBIchan (new, but promising)
http://y5fmhyqdr6r7ddws.onion --Anarplex (crypto-anarchy)
http://xf3fjq4b7j6pswuq.onion --Massive HTML5 audio porn collection
http://wtwfzc6ty2s6x4po.onion --Save the Sea Kittens
http://iuhcjx6fpeafstuu.onion --Scream, Bitch [DO NOT ENTER]
http://4iahqcjrtmxwofr6.onion --Strategic Intelligence Network (use small icons to navigate)
http://djmrwe2r45qf5bjj.onion --Good place to send newfags
http://xcomics5vvoiary2.onion --Adult Webcomics
http://dildosky53jnf5mt.onion --Dildo Sky (what it says)
http://nope7beergoa64ih.onion --BB Compendium (Tons of information)
http://nope7beergoa64ih.onion/Tard%27s_Library --Tard's Library
http://kpynyvym6xqi7wz2.onion --Parazite
http://xfmro77i3lixucja.onion --Imperial Library of Tantor
http://bdpuqvsqmphctrcs.onion --Another Tor Directory (4000+)
http://skunksworkedp2cg.onion/sites.html --Dark Tor Directory (1000+)
http://2qkkxuoajqzr35qq.onion --Telecomix (interesting)
http://4k2oq3fswx35a72s.onion --German coordinates
http://5fpp2orjc2ejd2g7.onion --Strange, drag mouse over page
http://aiehehuydsmd7rki.onion --Strange
http://kpynyvym6xqi7wz2.onion --Parazite
http://dmirrgetyojz735v.onion --Russian chan (one of the biggest)
http://naziorgukitfhvms.onion --Massive Hitler/Nazi archive
http://ninjaos4xt6nc2ft.onion --Possible riddle?
http://pfraojp7fxtdd5ut.onion --Another possible riddle?
http://owfffjaqvllmh4zi.onion --Refresh for random gifs
http://pja3dhxxpn4cba63.onion --Weird story archive
http://rhodiumio4b7b4rm.onion --Huge drug synthesis archive
>>54747113
What's the hidden wiki for?
>>54747180
//hiding//
>>54747113
Wew lad you took the bait
>>54747231
Hiding what?
>>54747113
>[DO NOT ENTER]