Actually I kind of find it annoying when another Canon DSLR user comes up to me and asks me all these questions.
For me, it makes for an awkward conversation, and I feel like I am being measured up, you know?
Several months back at beach, this guy comes up to me and it went something like this:
Him: "Hey, is that a 70-200?"
Me: "Yep"
Him: "F4 IS?" (This is when I used to own that lens...)
Me: "Yep"
Him: "What body is that? Is that a 30D?"
Me: "Nope, it's a 5D"
Him: "I have pretty much the same gear as you do in the car but I wouldn't dare bring it out in this sand storm."
Me: "I don't care about the sand storm" (Getting awkard here...)
Him: "OK, have fun"
Me: "OK"
That was useful...
I usually keep to myself when I see someone with a white lens, 2 bodies, flash, tripod, etc...
At the zoo I saw this guy with 2 bodies, one of them attached to a tripod, and a flash. I just had to laugh...
My wife was like "Dont' ever end up looking like that!".