well i dont know the exact retention yet because we started it few days ago.... so will need more time to give an accurate figure but it seems to be doing really good and wouldnt make sense otherwise...

about ratios, nats counts ratios on first page hits, with that in mind our average ratio is 1:300.....
i would like to know the join page ratio but dont know if possible, i suspect it would be around 1:50 or something... which is excellent.