Please take a look at this client site that just went live last night:
Client sells cookies that help nursing moms, and came up with the idea for a subscription to capture some repeat business through the year + that new moms are breastfeeding.
Overall, client is really happy with how the site turned out, but we're both a little bummed we couldn't better integrate the shopping cart and the subscriptions. This would be an amazing feature in the future, as I'm sure there's lots of folks out there selling things that make sense as repeat sell - dog treats, herbal supplements, flavor of the month clubs, etc etc etc.
Thanks in advance!