What's in your toolbox/bag??

We've all got a bunch of tools we take with us or use in our shop on a daily basis, I'm just wondering if there are any that are preferred by a lot of mechanics versus some that no one uses.
 
Everything I carry fits in a 5 gallon bucket with a Bucket Boss (I think that's who makes it) cushioned seat on the top that spins around freely.  Got a nice pad on top so it doesn't make a long day any longer.
 
Inside the Bucket, I have another feature of Bucket Boss which is a set of pockets in a nice canvas pouch that wraps all the way around the inside with various sizes of pockets and even a hammer holder for those motors that need a little extra love to loosen up a nut or bolt.
 
My all time favorite tool as an Arnold Multi-Tool that's like a Swiss Army knife with sockets on it instead of blades.  AND, it has 4 sockets at that.  On each of the large sockets, a smaller one (spring loaded) fits inside it.  I've also put some brass fitting cleaners on the tool as well in different sizes to clean.. well.. fittings.  
 
I think Arnold has gone out of business but, if you look around on EBay, you might find one.  Looks like there's about 12 of them and the prices range from $12.99 to $19.99 plus shipping.  Amazon only has 2 available..
 
Top Saw makes something like it but, it's only as good as far as you can throw it after you use it the first  time.
 
So, if you have a few minutes, tell us what's in your go-box or go-bag or the most important tool on your bench.