Hyperthreading security issue

When I first ran into this link on the internet I thought it was a joke. But it isn't. Before reading the details I thought it was bug in Intel's processors. But, again, it isn't. You may read a full technical description at http://www.daemonology.net/papers/htt.pdf. Mainly interesting for the concepts explained, as it is less likely that an exploit would appear sometime near in the future.