SSH Version mapper scan

[Pollywog <croak@shadypond.com>]

I just saw this in my logs.  Should I be concerned and why is it 
happening?   TIA

Unusual System Events
=-=-=-=-=-=-=-=-=-=-=
May 12 15:59:04 lilypad sshd[3442]: scanned from <SOME IP ADDRESS HERE> 
with
SSH-1.0-SSH_Version_Mapper.  Don't panic.
May 12 15:59:04 lilypad sshd[3441]: Did not receive identification string
from <SOME IP ADDRESS HERE>


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