Copper tape with conductive adhesive – We use copper tape for soldering to EL wire, and for the drawdio (to wrap around the pencil. This 3M brand stuff is high quality and sticks nicely to surfaces. It would probably also be great for making capacitive switch electrodes.
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I used this to make the "tracks" for the <a href="http://www.puzzlemation.com/">Puzzlemation</a> tiles to rest on. Worked great. One tip: If you want to connect to it electrically, you really need to solder to it to get a reliable connection. Just sticking the tape on doesn’t work so well.
Copper foil tape is a common Stained Glass supply with some great electronics uses. I installed under-cabinet lighting in my kitchen, and the light kit I used had a small touch sensitive puck you could place in the corner underneath a cabinet. I took some tape, ran it across the touch sensor and all along the lip of the cabinets. Now you can control the lights just by bumping into the tape anywhere along the cabinets, rather than try to tap the tiny hidden puck.
I use this to make temporary quick connections between my multimeter probes and my breadboard jumper wires. Quick and dirty, and works like a champ.
I used a touch sensor with dimmer and wired it into my bedroom light switch. I ran the sensor into some tape and ran it across the entire room, so you could turn the lights on from the door or off from the bed (or anywhere else for that matter)
My next plan is to use conductive paint to do the same, and have an underlying layer of this tape for the paint to conduct with.
Remember using this for non lead channel stained glass back in the day. I should go back to the stained glass shop and pick some up. I can see a lot of uses for it now that you bring it up.