I'd also love to hear from someone who has experience doing something like this. The article (that Spencer mentioned) had some valuable info but didn't have the depth I'm looking for.
Yeah, Videomaker almost goes there, but I agree would be great with more depth and advanced articles.
I forgot to mention, any live switcher that can work with HD will cost a lot, so doing the cuts in post would probably be the most practical way to go.
To answer some of your original questions:
Filming Church Service
I want to start shooting our church service on Sunday. I am a newbie! I purchased 2 Canon XHA1's, and I have a couple of nice quality tripods. That's about it!
I had planned on getting an audio feed from the sound board, pre fader, so that whatever the sound guy is doing, or not doing, will not affect me. I am uncertain on a few key points, (to say the least) and I would appreciate ALL the advice I can get.
First, should I record sound on both cameras?
Yes, you should. Recording sound might help to sync your videos in post.
How can I set the two camera's up so that I can monitor what both are doing?
For this, you'll want a live feed. One way you can do this is to use component video cables linked to monitors. As a warning, don't your S-Video. Component is probably the cheapest and more reliable way of sending video over a fair distance. My church uses BNC cables (which are more expensive, but better) and has their wires go under the cement to the video booth.
Do I just shoot two independent cassetes, and then merge them together in editing?
Yes.
Should I have bought the HGA1's, and then would they have synched together? Would that have made it easier, or higher quality. Would it justify the nearly DOUBLE price?
About syncing, you probably can sync them together, but I'm not sure. Does it make it easier: yes. Does it make it higher quality: not really. Does it justify nearly double the price: in my opinion, nope.
I'm not the "expert" on this topic, but there's my two cents.