The fridge is a pretty good unit, I think.  It's only 5 years old, and I could probably make it even more efficient if I'd get around to filling it up!  I'm single, and there's not much in there...  I do drink a lot of water, so have thought about buying a bunch of water jugs to take up the space and help hold the cold.  (Then I just have to remember to keep them filled!)

I've done quite a few of the usual conservation measures.  CFLs everywhere, the house was already well insulated, programmable tstat to set back the A/C during the day (usually never runs when I'm at work), things like that.  

I'm not terribly keen on grid-tie for a couple of reasons, first is that my utility company doesn't give that great of a deal on it - the very best I could do is reduce my electricity charge portion of the bill to zero (would still have the usual fees), I can't actually make money on them!  Considering my monthly bills average in the $70-75 range, we aren't talking much savings.  There are also no installation subsidies, according to findsolar.com the only thing I could get is the federal rebate.

Also, a major motivation here is backup power - while extended outages are still relatively rare, they are becoming more frequent.  Worse, the two extended outages that have affected me were both mid-winter during ice storms (also getting worse in recent years in my area) which is a miserable time to have no power.  If I put in an RE system, I darn sure want to be able to use it in an outage!  I understand it's possible to have batteries on a grid-tie, but it does seem to be the exception rather than the rule.