If you happen to do OTC deals with Ripple XRP (especially if you send BTC first), it is advisable to check the counter-party for red flags. Today, my command-line client saved me from being scammed for 2.5 BTC.
The party I've already done successful transactions with claimed to have 150K XRP for sale and asked that I send BTC first. I had no reason to distrust him, but as a precaution, I asked what Ripple account he is holding XRP at. Once I knew the account, it was easy to check if it has the XRP amount claimed:
$ rippler balances account:HIS_RIPPLE_ACCOUNT
It turned out, the account did not have anything close to XRP amount claimed, only 200XRP system reserve. When asked to explain this, my counter-party stopped responding.
Since a fully functional Ripple ledger browser is not available yet, you need to use Ripple API to check the counter-party in situations like this. Command-line line client offers an easy way to check any Ripple account for balances and history.
So this is the client I saw people discussing on IRC... Bravo, Arvicco, well done! Glad to know about it, I'll definitely be using it and contributing if I add any interesting features. And well-done on the MIT license. Generous move.