Spring Cleaning?

I have been wanting to really get my house more organized and cleaned (clutter free. we really do have so much clutter). I had hoped to do it last week since we had a garage sale on Sat., but besides getting some old and too small clothes cleaned out I didn't get much done. I made $30 at the garage sale so I call it a success (there was only a couple things I really cared about selling, the rest I was just going to donate to the Salvation Army).

Today Jeff and I got the garage all cleaned & rearranged (that happens twice a year - each time we have to change to/from snow tires on the truck LOL), so that feels nice. And then we cleaned & washed the truck so it sparkles :). Tomorrow we're probably doing the car (have to take advantage of the sunshine-y weather).

A lot of the cleaning I need to do is a few boxes of junk in the mud room/entry (and 1 or 2 from the garage), as well as several boxes in the storage unit. I think once I get that stuff cleaned out I'll be better prepared to organize the rooms. As much as I love moving and living someplace new, it's hard because you have stuff that fits in one house but then not the next, so I don't want to get rid of things because it might work again.

Question: What do you do with your kids artwork from school? the random art, not the Christmas gift stuff...
We have so much! And I know my mom kept my stuff, but when she moved she gave a lot of it to me and I threw it away, so then what was the point? Do I keep it or do I toss it?