WaMu must be the only CC that actually does periodic CLIs.
Like clockwork, today marked my 3 year anniversary with them and they gave me my regular 6-month cli...mind you it was small, $1500 - but hey, at least i didn't have to request it...
I think this the only card I have that actually does automatic CLIs, when you have good customer history- Amex has never done this. Nor has BoA, Chase, or any others.