We first felt Baby Stevens move on:
Laura - March 23rd, 15w 6d gestation
Matt - April 8, 18w 2d gestation
I had been feeling the baby move on the outside (with my hand) for about a week and was trying to get Matt in on the fun... Whenever I would feel kicking I would have Matt rush over and wait, since the kicks usually came in clumps. However, the baby would either kick somewhere other than Matt's hand, too lightly for him to feel, or just stop moving altogether.
The other night, Matt put his hand on my stomach without prompting -- I wasn't very hopeful since the baby wasn't moving at the time anyway, but he started talking to the baby and got one strong kick in the middle of his hand. And that was it. :-)