I filmed a wedding this year (the happy couple were both Police Officers), and their stills photographer was doing a homer. he was by day a professional Scenes of Crime photographer. I started with the usual banter, and agreed that I wouldn't get in his way pre and post vows, pre and post speeches etc, but in between was my time. Well goodness me, it soon became obvious he was a SOC photographer. He was bloody everywhere. At one point I thought he was going to lie the bride and groom on the floor an put white sticky tape round them. Quelque bawbag enorme (as they say in France).
I'd much rather work with real wedding still photographer any day, the simple agreement to agree what part of the day belongs to whom has always worked.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.