If you're new to seed collecting, check out my article that was just republished on DG for some non-technical tips:
What seeds are you collecting this year? My attempts have been pretty haphazard, but I've got a few things drying on paper plates... variegated yellow oxeye (Heliopsis helianthoides), burgundy Gaillardia, tomato seeds from a huge oblong paste tomato from Theresa's garden (not sure of the name, but it's not a hybrid).
"Hot & Spicy" basil seeds aren't quite mature, despite being allowed to bloom right away this summer... I might have to cover them or bring them inside when frost is predicted.
I grabbed some Celosia (both wheatstraw and cockscomb, in an array of colors) when we visited catoctin orchard a week ago... umm, I think those seeds are still in a pocket, wonder where? LOL
Are you collecting a lot of things this year or just a few? From your own garden or snatched from somewhere else?