What is highest block chain now?
My pool CoinMine.PW mining TagCoin with rate about 1GH.
Pool info page: http://www.coinmine.pw/poolinfo.php?coinid=87
You can check last block in right column.
Also several checkpoints

getblockhash 156620
0000000000f72df9128ec79dcdf2e705973331a7c64d4f8654701c4ea47482d9
getblockhash 156600
0000000000ea742c804f79fc972d28f44e9ba02320bf73d6a6ddcb06fa8699cd