BKG, sounds like you've got a bee in your bonnet about lighting but don't know what to do to get it out 
To kick off i'd start with some basics, http://strobist.blogspot.com/2006/03/lighting-101.html
and follow on from there. The strobist 101 will give you a good grounding in how to get your flash off camera and what you can do with it once its there.
Now, that will teach you how to use manual flash, which is what a lot of us use most of the time because its reliable and consistant and at least for the next few years the way that studio strobes work.
Moving on from that we have ettl2. It sings, it dances, it throws a fit if you didn't remove the yellow m&ms 
BUT, since you'll know how flash lighting works you will be in a better position to understand how to make the most of the clever bits of ettl and avoid its diva moments. My favorite guide on this is put together by FM forum regular Chuck Gardner at http://super.nova.org/DPR/
and then you will understand that its not crazy, its just trying to be too clever!
Oh, and finaly, hang around on this forum, i havn't been here long but its possibly the most useful lighting forum around.
I'll give you a quick rundown;
- Mobile portraits can be cheaply and effectively done with cheap, old hotshoe flashes setup remotely and controlled manually. You take test shots or use a flash meter to sort out the settings. You can trigger the off camera flashes with a wired cable, an optical flash sensor or a variety of radio systems from $30 to $300
- Studio strobes can be run off battery packs. Alien Bees with the Vagabond or Elinchrom with the Ranger approach this in 2 different ways. These systems will offer a lot more power, consistancy and access to some awesome modifiers.
- Canons ETTL system offers speed and flexibility in fast and dynamic situations. Where you dont have time to meter the light or your subject is moving around the scene the system will compensate, they also have a built in IR based wireless which is fine indoors with line of sight but kind of fail outside, you can get radio triggers which will carry the ttl data. This can be expensive and you are well into studio lighting kind of money.