Burley - nice. That's the same tackle bag I use for my hard baits. The thing is awesome. I rarely take the whole thing with me, but for me, it's a great base of operation. Instead of writing directly on the box though I put strips of athletic tape labeled with sharpies - this way when I get in the mood to improve the system, I can easily switch labels. I usually just take a backpack with me either with a couple of the 3700 boxes and a bunch of plastics, or I'll hand pick a bunch of lures and put them into much smaller boxes to fit in the backpack.
For my plastics I use little ziplocks (or sometimes the original packaging) inside of bigger ziplocks, then label the big ziplocks: senkos, kreatures, curly tail worms, tubes/grubs, frogs, etc. Then with that pile of big ziplocks, I dump them all into an older, smaller soft bag than that Cabelas one from which I've emptied the hard plastic boxes. This way I can put my scents, rigging tools, spare pliers, dyes and markers in the outside pouches.
It's funny - when I started to get into bass fishing hardcore about 2 years ago, I started with a hard drawer-type tackle box that had all my lures in it. About two weeks later, I graduated to a soft box with 8 3600-ish boxes, and a couple of months later, I graduated to the huge Cabelas one that has 12 3700s that also held my plastics. Now, I've moved all the plastics away from the hardbaits to make room, and my plastics sack is full to the brim. I think I have some issues.
Word of advice: don't get a tackle box that is way too big for all of your tackle because then you feel a very strong urge to fill it.