Very often they have the problem to find a good equivalent term/translation to a specific english one. There are allready good sources that may help like wikipedia.org, or simple online translation services like BabelFish. But often the language needed isn't supported there, or the required term. Now google offers a good extension to all the services: define:'s [via google blog]. So you can find out e.g. for RSS also some non-geek definitions (like 'Repetitive stress syndrome').