Leanne,
We are currently considering the possible addition (at some point) of Getting Started with Latin by William Linney. The same author now has a Spanish program as well.
I have looked at endless Latin programs and could never find one that would work well for a variety of ages, would still fit well within the more CM-style short lessons, required no preparation or planning, and was still understandable to a parent with no Latin training. I really like the looks of this program.
This is a very no frills, short and sweet and to-the-point program. The book comes with an answer key in the back and the website has free pronunciation audios for each lesson. It is written to the student to complete indpenendently, but it could also be done around the table with a variety of ages instead if desired.
It is definitely a beginning Latin program and would require further research for a follow-up program. However, it does teach Latin for the purpose of understanding many of the familiar Latin phrases and mottos we come into contact with in the day-to-day. It also teaches beginning Latin quite thoroughly.
It seems well-suited for a one-time exposure to Latin or as a jumping off point for future Latin studies.

We will be pondering it more for possible inclusion in a future guide(s).
Blessings,
Carrie