My current (half-baked) system is using ScanBot for scanning / OCR. This saves to an "Incoming Scans" folder in Dropbox. I then have various Hazel (OSX) rules

My current (half-baked) system is using ScanBot for scanning / OCR. This saves to an "Incoming Scans" folder in Dropbox. I then have various Hazel (OSX) rules to automatically organize things out into various folders w/ date organization: receipts, bank statements, bills, etc. Works somewhat well! You can do a search in Finder, which will also search contents, etc.