The number of my incoming links jumped by 50%. From 6000+ to 9000+ links in 24 hours. Looks like there was a major change.
They've been making changes for over a week. have you noticed any increase in your SERPS? one of my sites took a big jump in the Y serps and is getting double the traffic now.
Indeed, Yahoo is on a changing phase and advantages/disadvantages compared to the old algorythm will appear.