As for things that go with them, I like:

LifeJacket (vs. a trigger lock). I like that it covers the action, as well as the magazine release, and doesn't touch the trigger. I bought mine at Academy.
http://www.life-jacket.com/lifejacket/intro.html

Wilderness Tactical Belt (5 stitch) as a good value that works well.
http://store.thewilderness.com/product_info.php?cPath=43&products_id=1186

The Belt Man belts for a more traditional looking belt that holds up even better (costs more, but still a great value).
http://www.thebeltman.net/

Fast access handgun safe. This is where mine goes when it's not in the main safe or on my person. (There are many good options, this is just the one I have):
http://www.winchesterevault.com/

For the car, my wife and I each have one of these (keyed alike). Works well when carrying and you have to go in somewhere that is off-limits:
http://www.center-of-mass.com/