I just punched down a house for someone who's electrician was incompetent when it came to network wiring. In rooms with more than one network jack, one cat5 cable was run to the first jack, then onto the seccond jack. Seeing the one jack they'd punched down with wire taps of some sort on each of the 8 wires going off to the other jack was something else. I repunched everything else they'd started on after seeing that one jack.

The moral of the story: Find someone who knows what they're doing. If you're paying good money, they should be certifying the cable runs to a standard. (be it cat5, cat5e, or cat6)

Matthew