iamaKey came with a tiny plastic cap that covered the connector. Of course, after about 15 minutes the cap disappeared. I was concerned about that until finding out that iamaKey uses a gold SIP connector that resists scratches and water. You don't need the cap at all.
So, does it still work after almost two months of riding around in a pocket with a bunch of other keys and change? Absolutely! It's been dropped multiple times, it's gotten soaked in the pocket of a pair of jeans I was wearing during a sudden downpour, and it's put up with winter cold while I've been out walking. iamaKey is rugged and fast, with up to 30 MB/s read rates and 10 MB/s write speeds.
iamaKey comes in 4 GB (US$19.99) and 8 GB (US$29.99) flavors. LaCie also sells the less rugged and larger itsaKey, which retails for US$3 less than iamaKey.