I love postcrossing. :)
I really love the trouble that is taken over the cards that people send me and if I'm not careful I will end up turning into a stamp collector too because there really are some wonderful stamps out there.
I love most cards but my favourite cards are those showing UNESCO sites, famous people or food associated with the place where you live. As I attend university it would also be fun to get a card associated with further education or a university near you.
I enjoy it when cards have been written on and bear the stamp of your country - so please no envelopes!!
Update July 2013
Right now life is too busy for direct swaps !! Please do not ask as I will not be able to reply.
You may be able to see the unesco cards I am still missing here