Google Algorithm Change

It seems Google is changing its algorithm or doing some sort of change that stirring things up. Ive been seeing many sites that were in top positions disappear and vice versa.

Google ranking page-titles differently i.e. if the page titles contain your keywords, it doesn't seem to make any difference anymore. You can rank high even without the keyword in the title

is this true?

Or perhaps the weighting given to body text has been raised slightly and/or title text lowered.

We know that anchor text is a very important factor and at times trumps title text.

Maybe some competitors picked up a few more solid links with good anchor text; or maybe they changed the site navigation; or maybe just about anything.

Anyone else noticing these changes?

Feedback Appreciated