In my Witz PSK - no shelter, too small.
In my EDC (BOB 1 of 2) bag - a space blanket.
In my vehicle survival kit - a space blanket, orange tube tent, poncho, large black plastic garbage bags.
In my vehicle FAK - a space blanket.
In my hiking pack (BOB 2 of 2) - an AMK heatsheet, weather-resistant pullover.
In my camping gear bin - a nice tent, rain fly, and groundsheet! <img src="/images/graemlins/grin.gif" alt="" />

I recently bought an AMK 1-person emergency bivvy. That's going to go into the hiking pack. And there are a couple of additional AMK heatsheets to replace most of the various space blankets floating around. The space blankets will likely be used as backups.