This small patch adds IP lookup capabilities to the watchdog module using the free external site http://whois.sc. Basically, the IP becomes clickable, and a new window opens which displays a lot of data about the address in question. Might be useful for site administrators who need to look at suspicious activites, spiders, harvesters etc.
I got this idea from the phpBB bulletin board software, which offers this feature for administrators.
One line patch attached.