Huh. I've got a wristwatch which will probably run for a couple years if I don't use the light. I could probably sell it for a good price.
I've got my car key. It's got a LED; after ten years the battery must be close to dying but I think it could last for a good while more. I
could sell it, but I'd keep it. I've used it as an emergency light source at times; you can't read by it, but with decent night vision it's enough to figure out the general shape of your surroundings.
I've got some keys, papers and money. The metal stuff is cheap and fairly useless. Maybe sell the plastic cards as novelty.
I've got eyeglasses.
Must keep them and keep them intact, at least until I can afford a magical way to fix them (or, better,
remove disease - I wonder if
remove blindness works for myopia). In the right conditions, the lenses might be enough to start a fire.
I've got a cellphone, but the battery won't last more than a week or so, even if I make it work offline. I could probably sell it for more than the wristwatch, especially if I use the MP3 player function and camera, but then I'd have to run away very, very quickly. Those things are a power drain.
Alternatively, I'd keep the phone for later. As a computer programmer, I've got no skills at all that would be of even marginal use in a preindustrial context, save for reading and writing.
But I'd probably know much more math than anyone else in the world, and I find the idea of manipulating reality through arcane languages and mysterious devices which can cause terrible things if used by the uninitiated to be quite natural. Hopefully, that counts for something in the magic department.
At that point, chances are that I could develop a spell to recharge a cellphone, or at least make a
continual battery.
My cellphone has the complete 3.5e SRD.
Armed with a full, detailed and numerically accurate description of how everything in the multiverse works, I'd then proceed to conquer the world.
