Hi Ian,
Here is some
info on how RingLead can help with Marketo duplicates.
RingLead has over 100 joint RingLead/Marketo customers.
Dupe Dive is a free Salesforce duplicates Lead diagnostic that will give you duplicate Leads by source metrics that you should find useful as you develop your Data Plan.
If you are just getting started with Marketo, you might like this T
hree Cool Things You Can Do With Marketo Webhooks presentation.
Here is a great blog
post about the automate vs. intervene decision marketers need to make when it comes to data quality tactics.
If you'd like a trial of the RingLead apps, please let us know.