I'm just curious as to how many people keep all, or most of their domains with one registrar?

I used to keep all of mines at namecheap, however after I got my own reseller account, that also has a lower rate than namecheap. I've slowly started to transfer my domains over.

So how about the rest of you?

I tend to go with 2 or 3 different registrars depending on the type of domain.
All of the ones that I use are very reliable and I will generally go with the one offering the best price at the time of purchase.

I keep mine with Namecheap, but I don't have that many (about 6 I think). If they were more numerous, I would spread them between several registrars.