I just found 38 addresses that tried to scan my PC.. Make sure you are keeping peerguardian up-to-date if you are using it. It is ineffective if you are not adding new IP ranges to block.
The bulk of my scans were done by this IP address:
Which when I did a trace came back with this information:
OrgName: Double Click, Inc.
Address: 450 West 33rd Street 16th floor
City: New York
NetRange: 18.104.22.168 - 22.214.171.124
NetType: Direct Assignment
TechName: Ng, Alex
OrgTechName: Ng, Alex
ARIN WHOIS database, last updated 2003-07-29 19:15
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So I have now banned all Ips that begin with 216 from connecting to my PC. That should stop them for a while.