This is the 3rd year for Lettermo and last year, little achievements were introduced (e.g. sending something internationally, sending an old-style type of letter (think fountain pens and wax seals), and for sending some post even if you can't complete the full challenge). A great idea.
I think I will be able to complete both challenges, all being well. I think it would be nice to broaden the range of people I write to.
I think both these projects are great ideas to bring new people into the happy world of snail mail, and the joy of holding words of wisdom & thought from all around the world.