[typo] 'pings' table

[Gary Shewan]

What's the point of the 'pings' table?

It seems to just keep a record of every site I've linked to.  That  
seems to be a bit of a weight to my db without much use.  I could see  
that there _could_ be a use, but I don't particularly want to keep a  
record of every time I've hit one of the ping servers.

Safe to empty it periodically in the same way that I empty the  
'sessions' table once in a while?

Cheers