A few thoughts on camera rinse tank and table etiquette and safety:
1. Remember that the rinse tank is not your personal camera storage facility. Even though you may not need to change film/batteries/memory, you still DO need to remove your camera from the rinse tank so others can rinse and/or leak test their housings if they want to without having to mess with your stuff.
2. Nothing but cameras, except maybe your dive computer/watch or dive light -- depending on the boat's rules -- should go in the camera tank unless the trip is over and it is understood by all that cameras are finished and the tank is fair game for wetsuit washing. Nothing like going to rinse your camera and seeing a film of suntan oil from someone's hood.
3. If the crew is placing your rig in the tank for you after every dive, it might be beneficial to take your port cover along with you, or leave it on the panga and show the crew which one is yours. That way, the cover will be on your port when it hits the tank whether you're there or not. One of the panga drivers (Michael, God bless him) on my last liveaboard would actually bring your port cover over to you if you were picked up by a panga different from the one that dropped you off!
4. Collapsible buckets and/or soft-sided coolers can be a great portable rinse tank if the boat's is too small or if the boat doesn't have a dedicated camera tank.
5. The camera table, like the rinse tank, is shared space. Be mindful that there are others who have just as much money and/or emotional attachment invested in their gear as you do.
a. If there is a compressed air bottle for blowing water off the housing, DO NOT blow the water onto other people's stuff! Also, some people are firm in their belief that the compressed air thing is not worth the risk of blowing air/water past any O-rings so give it some thought.
b. Always look to see who else may be working on something or have their housing open. If there is too big a crowd, wait a few minutes or move somewhere else. On the last liveaboard I was on, there was a large table at the bow and I would routinely move there to make room at the camera table and give me a place to work with less distraction. If you decide to take your camera into the salon to work on it, for goodness' sake, make sure you dry it off first. Also, be mindful that other people will be using the salon for things like eating and taking naps so don't hog all the space when there is a camera table for you to use.
c. If you do stretch your stobe arms out to stabilize your housing, at least make an attempt to do it in the least intrusive way -- I've been on more than one trip where one person does this and ends up taking up half the table. As has been said, the floor offers the least chance of a tumble -- however, check with the crew before placing your camera there.
d. Most boats will have shelves under the table; some boats even provide baskets on the shelves for people to use. Use the darn shelves. It is not acceptable to store all or your dryboxes and pelican cases on the camera table. However, understand that the shelves and/or crates are probably not watertight so don't store unprotected lenses or uncovered electronics there unless thay are sealed from the elements.
e. Unless there is a compelling reason to do so, once an electrical connection is proven to be functional and watertight, don't disconnect it. Others may argue this point, based on the fact that unless you clean things regularly, they may corrode together and become fused but I've never had it happen; I have gotten a connection flood from constantly disconnecting and reconnecting the strobe cords (see below).
THE GOLDEN RULE: Do unto others, etc.: Everyone has paid to be there -- just because you have a D2X and the guy next to you has a Fuji F810 doesn't mean he has any less right to be there than you. In fact, you should thank him because he could have a D2X, too, and take up just as much space as you do! As long as you think about how what you're doing is affecting everyone else, you're probably doing OK.
THE NOT-SO-GOLDEN RULE (the flipside): Having said all this stuff about being polite -- look out for yourself. You have paid to be there, too. I was on one trip where I tried to help out by disconnecting my strobe from the housing between dives to make room for all the stuff on the table. Ended up getting a drop of salt water on the contacts. I'm doubt anyone else really appreciated my sacrifice. If someone is acting in a way that is unsatisfactory, make a decision about whether the person is approachable. Some people are very nice people who don't realize they are doing something that is bothering you -- if it is that kind of person just let them know. Other people don't care or can actually get hostile -- if it is that kind of person, talk to your trip leader or divemaster. They should have experience in handling situations like this.
Power strips: Always take one. Be sure to ask the crew where it is OK to use it. Some boats have dedicated charging stations and don't want stuff like that in the cabins. Also: try to find a "world-voltage" strip if you can -- then you don't have to worry about transformers and stuff.