In reply to collywob:
To be honest, if your profile grades are up to date then you'll get very limited return on your outdoor climbing from pushing it harder indoors. In fact, you're more likely to bugger it up by tweaking a tendon or something just before a trip.
Having said that, if you live a long way from any real rock then valuing grade progression indoors for its own sake can help you to stay sane.
If you haven't read Dave Mac's book, 9 Out Of Ten Climbers Make the Same Mistakes then you should. One really big message there is that there are much much better (and less injury-prone) ways of using your time at the wall than just trying to do the hardest problems you can for as long as your fingers hold out.
For my part, I've found that I've had dodgy fingers less often (touch wood) since I've been planning and rationing the time I spend really pulling hard on fingery stuff, and doing it early in the session and really enforcing rests in between attempts. Also since I've become more aware of what sort of thing buggers up fingers (uncontrolled lunges to small holds and hard pulls off pockets, basically) and been more willing to walk away from a problem if it feels like an injury trap.