I usually don't get souvenirs; I just enjoy the trip, but I did get three commerative plates this year. I got DL, WDW, and DLP plates because we visited all three in 2001.
Honestly, my fav souvenirs are note pads. I am a "list" person and always have at least one list pending completion. I pick up 3 or 4 each trip and use them all year long. I especially love the new one with the four parks represented on 4 differently shaped pads.