Astroweb, the principal service for astronomers, has a subsidiary page on physics-related resources. There is also a page entitled 'Pretty Pictures'. A mirror site for AstroWeb is incorporated into the World Wide Web Virtual Library. The connection to physics may be tenuous, but we'll give NASA, the U.S. National Aeronautics and Space Administration, a mention. Scientific American is a well-known U.S. monthly science magazine published in several languages and normally available anywhere in Great Britain, for example.
New Scientist is a British science weekly.
There is also New Scientist Hotspots. The author's favourite general-purpose search engine is Infoseek, and AltaVista also warrants a mention. Read the author's views on Link Syndication and consider an exchange of hotlinks as recommended. Other well-known search engines are Excite, HotBot, Lycos and WebCrawler. MetaCrawler is a search engine which does not maintain a database itself, but instead passes your enquiry to other search engines and collates the results.