For ordinary EDC, beyond the items already mentioned:

1. I'd add a pen and a small notebook (I use one by Clairefontaine that's about the size of a small stack of index cards). I like notebooks much better than random slips of paper for writing down phone numbers and stuff like that. I use Write Bros ballpoint pens (85 cents a dozen at office stores), not any fancy type.

2. I like having a digicam with me, though I won't say I -always- carry one. One of my fairly common uses of it is as an impromptu photocopier--with my Canon A530 (cheap AA-powered 5MP model), photos of printed pages are just about always readable, if I'm a little bit careful to hold the camera steady and the available light is reasonable at all. (Don't use flash, it causes glare). I don't think camera phones are as good for this but I haven't tried one. In other regards, a camera phone might be ok. Of course there are smaller full function cameras than the A530, especially if you tolerate lithium-ion batteries (I hate them and avoid them when I can).

3. I haven't felt the need for a SAK with tools that often. A small keychain knife is enough most of the time.

For those treating this as a PSK question:

1. Ditch all the firestarting stuff and the saw. This is an urban kit, not an outback one. You're more likely to be running away from fires than trying to start one. Your saw won't work on concrete.

2. The Photon is really enough of a flashlight but if you want/need a more powerful backup, try a Fenix L1P or L1T. This runs on one AA cell and is quite compact and bright. You can always scrounge an AA out of a quartz clock, a cordless mouse, somebody's Walkman, etc.

3. A radio (FM-only is ok in a city) to get news updates is very useful. If you want to keep things tiny, I guess you have to go with the earphone type, but if you can manage it, one with a speaker is nicer. Some cell phones have them built in.

4. Make sure your cell phone is set up to send and receive text messages. These use far less bandwidth than voice communications and as such you have much better chance of getting a text message through than a voice call, when the cell phone system is overloaded.

5. Spare phone battery. I've been looking all over the place for a phone that runs on AA cells, making spares a lot simpler. They don't seem to exist any more. I know about the charge-2-go gizmo but I'm not looking for a last-ditch method of recharging lithium cells, I want to throw away the lithium cells altogether and use AA's (normally rechargeables) all the time.