When providing feeds for a web site (RSS, for example), there tend to be two camps: those who provide full entries and those who provide just an excerpt or summary. In the latter case, the rationale is often to drive readers to the web site to read the actual article. However, that can be inconvenient for people who follow hundreds of web sites through their feeds. In fact, it can have a negative effect if people don't follow the summary at all.
Decaffeinated has a good discussion of the issue and an argument for including the full entries in feeds.
I'm a strong believer in full entries and in the past have tried to evangelize their benefits. This article will be good ammunition for such discussions in the future.