Matt Cutts is the head of webspam for google. He announced a small upcoming algorithm change which is meant to reduce the amount of low quality exact match domains in search results. Exact match domains contain keywords that exactly match the search query.
Cutts also tweeted, “New exact-match domain (EMD) algo affects 0.6% of English-US queries to a noticeable degree. Unrelated to Panda/Penguin.”