What would you like for the next minecraft update?

Hey guys, I was wondering what you would want Mojang to add in the next minecraft update! I know 1.7.2 just came out for PC with stained glass and carpets and such, but I really want them to add some sort of a block that can store power from furnaces and daylight sensors and use it whenever you need it, like storing solar power during the day and using it to power redstone lamps. I know there are mods and things like that for this, but for security reasons, I do not download these from untrusted sites. That only leaves the updates, which only come out like once a month. So, what do you guys think?