I know I saw someone else mention killing some time by reading peoples negative feedback and responses. I can easily kill a couple hours reading these because they are a riot. Here is one of my all time favorite responses:
Horrible player... constantly missed turns... and waited until the last minute to make his moves... this guy is going on my ignore list!!!
Swizz70's response: Im sorry but some people have lives not just sit here 24/7!!! U wanna challenge somone hu is the son of a multi-millionaire then fair plaay but i could buy this website out with my weekly allowence!!!
My other favorite response is from ltktrex, who is a bit confused. I won't post it because it probably isn't appropriate for kids, but if you want a good laugh look under his neutral feed back.