CogBlog

It's interesting when you hear a bit of news that goes against long time widely held perceptions. Comscore has come out with a report that shows, among other things, that there is very little difference between deletion rates for first and third party cookies.

What's more interesting is that the study shows 27% of users delete all cookies once a month, and 7% do it once a week. So, that could inflate numbers of Uniques in your cookie based analytics tool, or hurt your numbers for other metrics like delayed conversions or repeat visitors.

Some more good discussion here:
Web Analytics De-Mystified