QUOTE (Rocha @ Dec 24 2005, 06:35 AM)
You cannot use the housing without a port . . .
Actually, you CAN use the housing without a port . . . unfortunately it means you'll be flooding the camera and buying a new one so it's not really recommended.
Seriously, you've got a good setup. I also shoot with a D70 (until I pick up my D200) in an Ikelite housing. Although nothing's perfect, I've been generally very happy with it and feel I've gotten some pretty good results.
Because of the 1.5 crop factor, it turns the 105 into a 157 which makes the lens harder to use but also allows you to take images that you might not get with a film camera. Since I like shooting macro, it's a good choice for me. And I can get stiff like this:

I also use a 28-105 zoom (effectively a 42-157) and the 18-70 (effectively a 27-105) that came as partt of the D70 kit. That combination of lenses gives me a lot of versatility IMHO. As I'm not personally into shooting really wide, I don't use a 10-24 or anything like that.
Although some ports can serve multiple lenses, you'll generally need a different port for each lens. Zoom lenses will take dome ports (and general require a +4 diopter on the front of the lens to allow it to focus on the virtual image) and the 105 takes a flat port.
I shoot with two strobes but you can start with one and get a feel for shooting with the system. As mentioned previously, you'll get some shadows depending on where you place the strobe. On the other hand, if you're okay with a flat lighting look, position the strobe above and in line with the lens and you shouldn't see too much shadowing (but may pick up backscatter), especially if you're shooting with ambient light and using the flash for fill.
Enough babbling from me. Good luck with the setup and welcome to the wondeful world of digital.