Just to keep it simple: What rankings of mathematical conferences and journals are available in the internet? (I'm only interested in rankings, not about any discussion about rankings.)

There is the Report of the IMU/ICIAM Working Group on Journal Ranking (June 2011), and the IMU blog on mathematical journals, discussing exactly these questions, and giving lists of such rankings. 


The Australian Mathematical Society have produced a ranking: http://www.austms.org.au/Rankings/0101_AustMS_final_ranked.html It is widely used (for instance, by my own institution in the UK). When choosing where to submit I also make use of the following ranking of journal prices/ value: http://www.mathematik.unibielefeld.de/~rehmann/BIB/AMS/Price_per_Volume.html Of course it's a different type of ranking, but you might argue that it's a lot less subjective! 


You can also check out http://zbmath.org/journals/ for details on the journal content. It doesn't give you a ranking though but you see at a glance, who published in the journal you are interested in or what topics are represented in the articles. 

