(With feed reader caching and other variables, I can’t be sure this is fixed – sorry it you get “summary” feed rather than full text – I’m working on it).
I didn’t notice at first, but apparently WordPress 2.1 and later no longer provides full-text feeds. (See this thread in WordPress Support).
Even if you have selected the option for full text feeds, using the <!–more–> function will result in your RSS/Atom feeds getting cut at the break.
I’ve installed cavemonkey50’s full text feed plugin which should fix the problem.
Sorry for the inconvenience.