Sending holiday cards, but I don't have addresses, so I made SendSpree
sendspree.com
sendspree.com
But I like the open-ended use of SendSpree. Though I wish I could just type in an email, instead of having to auth with one of cloudsponge's gmail/etc integrations. This reminds me to code up a simple mailer/form for Picplum users to fetch addresses. Though oddly enough it has rarely been requested from our users.
Also, I accidentally figured out what port they are running on because FB redirected me to it when I didn't agree to connect.
On a side note: I see Twitter Bootstrap, Mailgun, and Cloudsponge. Any other providers being used here? I love seeing projects that take advantage of the available resources / frameworks. Truly nice work.