What do you guys keep in your pentesting/hacking kits? Mine isn't very much, and I want to add a few things to it.

This is what I keep in my kit:

Asus EeePC
USB DVD burner
USB HDD (120GB)
USB Flash drive (4GB)
BackTrack
Helix
Knoppix-STD
nUbuntu
The BBC LNX disc that came with the C|EH certificate
A paperclip (for opening CD-ROM trays)
Screwdrivers
Lock picks (for computer cases with locks)
Flashlight
A notebook (you know, that analog thing that you can write in )

Some of this stuff gets used more since I'm the network admin at work, but it's still part of my kit.

I'm looking forward to some good responses.

i take it that since you have so much equipment, you are a pro pen tester, eth3real.

I think if you search for it, you can find somewhere on the web to download it. I don't think it's maintained any longer (and hasn't been for a while if I remember). I couldn't even get the copy that came with my CEH to boot up.

Just my 2 cents:
I don't really keep a mobility bag for pen testing other than my preloaded usb hard drive (dual boot win xp and BT3), the normal collection of live CD's, and the usb wireless adapter I use for wireless hacking.  The rationale for this is that the majority of our pen testing occurs from a lab which is already setup for our use.  I use the this stuff when we've been asked to do a pen test from within the client site.  Most of the items you guys have mentioned (cables, screwdrivers, etc) I have in my forensics toolkit from when I used to regularly serve search warrants.  It hasn't gotten much use in the last couple of years, but the things I've noticed that you're missing from that list are:
-a variety of power supply connectors and cords, these always seem to come up missing when you need them
-cables for connection to SATA/ATA/IDE/SCSI hard drives, again, always seem to come up missing when you need them
-external and internal floppy drive, you'd be surprised how often you'll need these on older systems and you can't always count on usb support

My Kit:
Dell D840 with 3x HDD caddies, 1xWin2K, 2x Linux HDDs. Laptop modded slightly to allow an external Wifi aerial.
2 x USB to IDE/ Mini IDE/ SATA connectors.
2 x 500GB 3 1/2 IDEs
1 Omni and 1 Cantenna directional aerial
1 PCMCIA SCSI card with adpaters from 50 way SCSI to SCA 80 way
1 3C589 NIC
2 x 10MB Fibre-CAT5 media converters
2 x 100MB Fibre-CAT5 media converters
2 x 1GB Fibre-CAT5 media converters
8 port Dell 2708 Power connect configured to repeat traffic on ports 1-4 onto port 8
various CAT5 cable
various Fibre optic cable
2 x BNC T-Pieces and some coax.
Mini USB mouse
Lock picks
Hacksaw
Jewellers screwdrivers
2 x No. 1 crosshead (posidrive) screwdriver.
Gerber knife
Wire strippers
Various USB connection leads
USB dvd burner
CD case with Installs and live CDs and a smattering of small capacity 2 1/2 HDDs, just in case.
Notebook
Mobile Phone and charger
Analogue 'butt' phone.
Various power leads, 4 way power strip.
RF video camera. RF audio transmitter. RF video receiver. RF audio receiver.
RS232 cable and breakout box.
Crocodile clips.

This all fits in my laptop bag except the directional Wifi aerial. The bag is VERY heavy when full.

The hacksaw is for when he's on the road.  You know the story: you're in a hotel for a week while you're doing the pen test, you meet someone in the hotel bar, bring them back to the room, it goes badly, and the next morning you need to get handcuffs off your wrists and ankles.  We've all been there.  As for the aerial antenna, the big one we keep in our office is so big that we carry it around in a golf case. It was already here when I got hired, and I'm still trying to figure out how they put the business case together to convince management to pay for it.  I've seen it used all of once.

It came just after the lockpicks.....

But I like the handcuffs idea!

I think a tone generator and probe would also be a nice addition to this kit. We have one in the office, but it looks like my boss took it home for the week.

Some of this stuff, you really have to ask yourself "Okay, should this really go in my laptop bag, or should this stay in a toolbox in the trunk?"

Thanks for the great responses!