Along the lines of one of the suggestions in Feature
Request #584673, how about allowing users to choose
how much of each item to show?
The "My Settings" page could have a choice list
with "Titles Only", "First 240 Characters", and "Full
Text". Just that much of each item would then be
shown to the user. It would go a long way to allowing a
person with multiple feeds to scan past articles they've
already read, and you wouldn't need to play any games
with dynamic pages or CGI.