CounterWallet a deterministic web-wallet for the Counterparty protocol is live on Testnet.
https://testnet.counterwallet.co/#
Step by step instructions at:
https://www.counterparty.co/counterwallet-live-testnet/
Bug report thread for Counter Wallet on Counterparty's main forums:
https://forums.counterparty.co/index.php/topic,188.0.html
(The protocol itself has been running live since January 1st)
You can use a Testnet BTC Faucet to grab some Testnet coins, and the wallet's built in functionality to burn them for the protocol's native currency XCP.
https://en.bitcoin.it/wiki/Bitcoin_faucet
If you'd like you can also post an address in this thread and I will send you some Test BTC's.
Counterparty protocol provides 2.0 functionality on the Bitcoin blockchain.
Including;
Send: XCP or user-created assets
User-Created Assets: Issue user‐defined currencies/assets and pay dividends on them.
Distributed Exchange: Trade XCP, BTC or any asset with any other.
Feeds: Broadcast information, which may be used as the subject of a bet.
Betting, Financial Derivatives: Make bets, or construct contracts for difference, on the numerical value of a feed.
Bitcoin Talk Thread: https://bitcointalksearch.org/topic/annxcp-counterparty-pioneering-peer-to-peer-finance-official-thread-395761
News Blog: https://www.counterparty.co/news/