Split shot lead sinker: good idea; will buy some when I buy more fishhooks.
Rope as tinder: I will try burning a piece of a few kinds and see how it works. I was excited about the dryer lint idea, but my experiments were disappointing. The standard to beat, right now, is my MRE napkin.
Water purification tablets: Good idea; actually, I meant to list that under "planning to add." The idea would be that worst, worst case, I could fill the condom with river/lake water and throw in a tablet.
Signal mirror: I could just polish the inside of the altoids tin or the lid and use that; I'm not sure how well it would work, though.
Needle and thread: good idea. Will add this.
Waxed floss: I assume this is as sewing thread (for which it's quite awesome); is this right? I have found it to be stronger than most thread, so might throw some in for clothing repair.
Razor blades: also a good idea
Magnifying glass: not really sure what use it would be; I mean, yes, starting fires, but I've got matches, so it'd be redundant. I'm in favor of redundant means of firestarting, absolutely, but it's got to be really compact, or it'll take the place of something else I could carry.
Piece of hacksaw blade: not a terrible idea, as an alternative to the wire saw. Ought to do a comparison test sometime. Bulk, and cutting power.
Mini Leatherman/other Multitool/mini swiss army knife: I will keep my eye open for one. This would definately be the bulkiest item in the kit, so it's got to be just right, no useless crap.
Band aids: Is it just me, or is any injury that will be okay with a band-aid, will be okay without a band-aid? I understand the idea of keeping dirt out of the wound, and keep you from bumping it...yeah, now that I say that, you're right, a band-aid or two, and an antiseptic wipe wouldn't be a bad idea. Hate to have a little cut get infected. Good call.
Mini-flashlight: have been keeping my eye out for one that will fit, without displacing too much other gear.
Safety pins: Seem maybe useful, but since I'm trying to keep this to the bare minimum (anything I put in takes the place of something else, obviously), what would they be used for? I know you can use them as fishhooks, but I'm just packing fishhooks, which are smaller. They can be folded up in a piece of paper or something, to keep them from poking anything, but the tin keeps them from poking me.
Paper clips, Q-tips, toothpicks: what for? I mean, in terms of critical, last resort survival; obviously they are nice things to have day-to-day.
Bottle of iodine or rubbing alcohol: I think a few water purification tablets and an antiseptic wipe would be more compact. I'm not sure what kind of bottle I'd use. Something with a dropper, I'd think...ooh...like the little plastic squeeze-dropper those "Ice Drops" breath freshener come in! That would work great! And, since I've eaten all my altoids to make room in the tin, I can freshen my breath with them in the mean time, to empty the little bottle. Awesome. Great idea.
Pencil and paper: I can see there being uses for this. Small golf pencil and a few sheets of folded paper (which could also be used as tinder).
Packet of sugar or jolly rancher: I see the idea of "super-duper emergency food item" for energy. A sugar packet is a good place to start. Any other ideas?
Cracker jack compass: great idea. I don't eat much Cracker Jack, though. Have to figure something out about that one I guess.
Map of local area: good idea, however, seems too generalized to keep it in a super-backup plan kit, since you never know exactly where you're going to be.
Aspirin: I've never found aspirin to make a difference between functionality and non-functionality. If I've got a headache, it seems to be an annoyance, not debilitating. Hate to get my aspirin mixed up with my water purification pills. Any other opinions about aspirin? Also, what about a few caffeine pills?
Packet of salt: good idea. I have left over from an MRE, I'll add that. For consumption along with water, if available, during periods of exertion.
$50 bill: ideally, yes. In my present situation, I'd rather have $50 worth of gear I'll use now. There is some good opportunity to double up roles here though: a few bills could be useful, even small bills, because if you can't spend 'em, you can use them as tinder.
Shoe polish tin: good alternative. My altoids tin is the round kind, not the rectangle kind, so it's very similar to a shoe polish tin.
Tin foil: Good container to boil water in, I've heard. Will consider it.
Saran wrap: what for?
Lots of monofilament: good idea, I plan to add some more to mine.
Piece of paper with a credit card number on it: damned good idea. A calling card numner, in case you find a payphone, would be good too.
GREAT IDEAS, guys. Very helpful. Thanks.