I lost the best link i found for it... but here is one from CBC
http://www.cbc.ca/news/technology/internet-outages-slowness-spike-expected-with-512k-1.2737819
Pretty much.. some internet nodes, are running into this current roadblock.. there are just TOO many people for the memory and current config.. that its litterally bottlenecking and not being able to do all the routing.
A major one i know that is effected, is Level3, which is a major one in the US, which MANY online games seem to have inbetween them and ISPs.