I have got the SPY feature similar to digg spy in my startup called Rivals4Ever (http://www.rivals4ever.com). Difference is in digg it is in flash we have used javascript instead.
Now the question is: will this kind of feature help getting more users to my site or should I have features like blubet.com or orkut.com where those small windows pops up automatically on right bottom of your browser ??
Advantage of automatic popup is user dont have to click some link to goto SPY, it does automatically but at the same time it is annoying.
In my case user first have to click "R4E Spy" and than he will be taken to SPY page.
So which method you think is more useful to attract more users ? Please let me know your comments by visiting rivals4ever.com