Does Yahoo! algoritm has any significant changes since May?

We used to optimise for Google, but new site got into the sandbox. This way, Yahoo! is a very good alternative search engine.
The last data I collected were May or April of this year. Can anybody give me a hint about last Yahoo! algo updates.
Onpage optimisation, meta-taggs, twice more keywords...
Anything else?

Thank you

 

Hi, well, no exact data but apparently they are loving links more than before and put less emphasis on onpage factors.

 

thanks
and I have a weird feeling that they are still changing.
every time something fails in my PPC on Overture I wait for surprises on SERP

 

They're trying to follow Google's example in this way, but they still have a lot of work to do.