I just found a new feature in 2.48, and i tough in making this thread were we can all post the things we find new in 2.48 that are not so obvious.
So here i go first : If you have the frame number showing in the viewport (if you dont you can enable it in the user preferences at the top) if there is a keyframe in that frame it looks yellow, if its not it look white.
The color may change depending on your theme, but the feature is the same.
Who’s next ?:D:D:D:D