[AgentIcarus]

I'm not a huge fan of this question. I've been programming for 20 years (professionally for 13). Is the hardest problem some noddy maths i worked out at 15 to convert real coordinates to screen coordinates? Is it the first app i wrote out of college when i learned that servlets aren't thread safe? Is it what i worked on last year to design my current company's authentication/authorization system?

I find it very hard to interpolate between these examples. And none of them are "hard"! I haven't written an OS or a more efficient linked list. All I've done is plugged away at something until it works.