re: Will this be Spirit's last Summer?
I gave up trying to predict the longevity of the rovers a long time ago :)
Without a major cleaning event, next winter will be hard for Spirit - but we've always thought that 280 Whrs was the 'death' limit for Spirit, and it went below that during last winter and came out the other side fine. The only predictable thing aout their longevity is that the predictions are usually beaten.