1) O365 syncing - it would be great to sync up calendars and email with Office 365 (and Exchange in general). Obviously this entails a lot of work, but it would definately put DoogiePIM into a higher category of PIM than anything else out there.
2) Add expense tracking featureset to the financial section. Have a place to document and store receipts (if you come out with an Android version, you could integrate a "take a picture of the receipt" feature. Syncing to Expensify or similar heavily used service could be a long-term feature.
You could even do an Enterprise version that encompassed the two above features (and others) and charge more as I'm sure there would be strong demand from Enterprise users such as myself.