A quick suggestion: A small trickle of science points are gained for every minute or hour that a craft is up in space. This would make satellites and other long-term (or permanent) probes serve a purpose in the game. Unfortunately, under the game's current programming, a satellite/probe can only serve a useful purpose (read: generate science points) for a very short amount of time, based solely on its orbit. I suppose a heavily eccentric orbit can have a satellite/probe pass through Low Orbit, High Orbit, and maybe even low enough to qualify as a biome (on bodies with no atmosphere). But after they've traversed those areas once, the craft no longer serves a purpose, as all of the science projects have been performed (once you hit the wall of diminishing returns). Short of installing a mod that lets a satellite map the surface of a body, or act as a communications relay, satellites/probes don't really server much of a purpose once they've completed half an orbit. I'd love to see a pay-off for leaving them in orbit long-term. Of course, there would need to be a limit as to how many satellites, orbiting the same body, would be allowed to rack up science points. Maybe one at a Low Equatorial Orbit, one at Polar Orbit, and possibly one at Synchronous Orbit. So any satellites past those three wouldn't generate any science points in a passive manor. I think this would encourage players to progress on a more normal (or realistic) space program evolution; by sending up satellites and probes (before sending Kerbals), that generate them a little trickle of science points. This small trickle of science points could prove useful to new players, while later on in the game, this small trickle wouldn't really mean much to them.