Google has extended the coverage range of sources returned in Google News search results. Instead of just 30 days, results can date back (at least) to 2004.
Bing has made two significant changes in the way it handles and recognizes search connectors to exclude keywords/phrases or entire domains from search results. The changes also effect Yahoo, because Yahoo Search is powered by Bing.
The Bing and Yahoo! search engines were both unavailable for much of the business day on January 2.
USA.GOV discontinues Advanced Search page.