We've created a closed-loop support feedback tool native within Marketo/Salesforce. Contacts complete a survey by filling out a form that updates their record in Marketo.
Since the data needs to be written to custom objects in Salesforce, we can't use Marketo to sync the information so we're using Dataloader.io to feed the information into Salesforce.
Dataloader.io has connections to Box and Dropbox and also has the ability to schedule cronjobs from those respective locations.
It'd be nice if Marketo had a Box API with which it could use to dump daily reports so that we could bypass the manual process of exporting a smartlist and jamming that into Salesforce via a dataloader.