I have been looking at my stats and keywords like I used to do for a long time. I do see an increase again of keywords appearing in the topresults (some came from quite far and are hopping van 3rd to 2nd page to top5 positions again). I do believe the "re-indexing" theory "dusky" has been talking about may be correct.
I am not seeing a BIG increase in traffic but I DO see some tops again.
I have been checking some positions on a hospital pc (i needed to be there anyways :) ) and saw the same results (so personalized search was not in effect at all).
I have got my "hopes" up it will continu to go upwards again. A 80% drop is not a funny drop to be experiencing ;)