One of the great things about WordPress - and a possible reason it trumps every other blogging platform - is the number of great plug-ins being written daily by geeky volunteers with time and code on their hands.
Some are more useful than others but few have better names than the funny “What would Seth Godin do” plug-in. No prizes for guessing who inspired it.
This clever bit of code uses cookies to separate new visitors from old hands allowing you to deliver a warm welcome message to your newbies.