“Every best paper from CS conferences” does not really sound like what this site does—list best papers from 11 CS conferences, a marginal fraction of how many CS conferences are out there.
the title is wrong. it’s not every “best paper”: notably all best papers before 2005 are missing for ICML. In terms of metrics of research quality, not all conferences are equal, and “best” papers are often selected by a relatively small group of people whose decision isn’t really validated too much.
A good link, but the title may be misleading.