Save the world - use rechargable batteries

Thomas Distributing
They may have one of the ugliest websites I've ever seen but they also have some great products.  They sell high-capacity rechargable batteries.  For digital cameras your standard batteries will last mere nano seconds.  I use 2200 mAh batteries in a Canon A70 and they last quite a while (has to do with the capacity drop off curve...check this out if you want the geek explanation.  Green Batteries).

maha_powerex_2300_mah_aa_rechargeable_batteries.jpg I use the PowerEx 2200 mAh AA size with a MH-C204F charger.