Several different types that I use:

[list]
- Titanium folding spork that occassionally collapses and isn't long enough at times.
- MSR folding plastic spork that is extra long (great for mre's and my deeper pot) and is my current fav.
- Jetboil plastic collapsible spoon and fork (too many bits to clean and sanitize and doesn't stay extended)
- MRE long plastic spoons (occassionally break)
- Steel interlocking utensils (who needs the knife?)
- fast food joint plastic spoons (free but too short)

I prefer plastic to prevent any damage to my non-stick pot.