Hey Jonathan,
It should be pretty easy to implement MailChimp into your cart as long
as your source code isn't encrypted.
You didn't call /everyone/ on the expert page. The company I work for
is in the top 10 on that list and I double checked with the owner and
we didn't receive your call.
Where would you need the MailChimp integration? Only during
registration or would you also need a customer area where they can
subscribe/unsubscribe or check their current status.
Most of the integrations I do have 3 signup areas: homepage,
registration and my account.
Depending on your timeframe and how many integration points, I might
be able to help you out. Let me know.
- Jace