agree on 哈尔滨.com being valuable.
as for 黄.net depends IMO. if you don't have alot of Chinese .nets then maybe renew if you have a bunch of them then I wouldn't blame you for dropping it, I have dropped many .nets this year. keep in mind that Chinese .nets will get aliased(not a great choice)...search the board for the discussion but at least it gets aliased. a couple of other things
1 no revenue I assume (- 1)
2. relative easy development potential its a surname so at some point you should at least be able to sell email addresses, once it goes in the root and the software supports it. (+1)
3. .tv, .org, .tel all regged (+1)
so I would probably renew, I guess