To those I should email more often, but don't:

This is for you.
I know I'm bad at keeping in touch and sending those nice, newsy emails that we all love to receive. So I'm trying something new. I'll try to keep this blog updated and full of pictures, news, stories, musings, etc. That way all of you will be able to access it, and hopefully we can stay in touch (without you having to wait for me to send an email.)
Hope this works!