There can be two possibilities.
1. The mentioned Bitcoin address does not belong to Silk Road. Most probably, it was tagged by mistake.
2. The wallet belongs to Silk Road, and pending/scheduled payments are still being made.
That said, I can see that most of the payments are micro-transactions (usually
BTC0.0001 or
BTC0.001), but some involved significant amount of coins (I could see one deposit of
BTC0.51084).