I've noticed and suspected for a while now that Google have gone back into the depths of time and re-introduced a time filter (like the one sused by Yahoo) to try and control their results and stop "rank spamming" via link building. Don't know if anyone else has noticed, and can add supporting evidence, but... I suspect that in the past if you built links you'd see movement within a few days - this lets you know your link building is working, and more specfically which link building is working. So you can repeat it. Now you can see delays of weeks, even months before any links cause movement. This results in : You build a load of links and nothing happens, so you build some more. Nothing happens so you build some more. Nothing happens so you build some more. etc. Eventually either you get caught because of the link velocity, and your site is toast, or... Your site eventually starts to move upwards - but because of the time delay, and the amount of work you've done - you don't know what was effective, and what wasn't, and so you can't easily replicate it. I have still seen new really good links cause a shift within days, and other sites not move for ages - maybe theres a sliding scale to really confuse things? Anyway, any other data - great, otherwise enjoyone of the best episodes of Dr Who!