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as above.
it's also distinctly useful due to the vibrating alert. if your meassage recipient is using a silent profile, or if the device is in their purse or pocket, a message may go unnoticed. if you PING them, the vibrate is less likely to be missed.
keenly, BBM will show "delivered" (D) and "read" (R), so you can tell if you've sent messages which have been delivered, but not yet been read. also, my wife and i have occasionally experienced a "stall", where several messages sent (usually during an active exchange) will not show checked, or may show several stopwatches as the messages sit in queue. PING-ing the other seems to force its way through, and shoves the undelivered messages on ahead.
(i know that last part wasn't very technical, but it's what we've observed.)
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