How should I negotiate price with bicycle salespeople?
Don't expect much until you know the guys that work at a bike shop. I bought my first road bike (a single speed) from my not-so-local LBS because it was on sale (45 miles from my house, with several bike shops in between). In the process, I discovered that I got along well with the guys that work there. In return for our growing relationship, they started giving me pointers about maintenance, and discounts on accessories (computer, bar tape, etc).

When I referred my father-in-law to them to get a bike (he's a doctor and doesn't have the same price constraints that I do) they gave him a pretty good deal because I sent him. I have no doubt that when I've saved my pennies enough to budget for a new bike I'll get as good a deal as they can offer me, without having to ask for a deal.

Most bike shop employees and owners could make a lot more money doing something else, but own/work at a bike shop because they love cycling. I appreciated the desire to stretch your dollars as far as they'll go, but nobody is entitled to special deals without earning them.