some of the older greg egan stuff (he was a programmer). i can't remember any titles, but a look at the summaries should make things clear (or his site - http:

some of the older greg egan stuff (he was a programmer). i can't remember any titles, but a look at the summaries should make things clear (or his site - http://gregegan.customer.netspace.net.au/ http://gregegan.customer.netspace.net.au/) [edit: ok, so after looking there (ow my eyeballs!) permutation city is one i remember, and there was also a collection of short stories...]