I like the style of these, in that most have low barrier to entry but for the hustle. Also, I don't think any idea is ever really "done", only incumbents waiting to be challenged. It does make sense to ask 'how is this different from X?' but often times the differentiation comes down to just being more hungry than your competitor.
These scribbles from my notebook may be a bit more tech heavy or have other barriers to entry;
Student loan servicing
Programmatic corporate founding docs, term sheets, seed rounds (legalese as code)
Self managed SMB 401k/IRA/125/etc SaaS
Crowd-based intermediation of credit [card] payments
Single-click self-hosted [insert data-sucking, privacy violating SaaS here]
SMS for every business
Bid on anything (build the demand curve)
Stop social fallout (crisis management as a service)
P2P two-party escrow
Telepresent expert hired by-the minute/hour (fix my ___)
LouisCK as a Service (the way he sells his content, not him specifically)
Self-hosted everpix
Yours If You Want It - A way to buy a gift for someone, but only if they 'accept'
Disciple - Subscribe to talks by geniuses in your industry
And the one I'm currently working on... passwords that can't be cracked.
The LouisCK as a service is the same idea I had pretty much but for script (movie) writers to find a production crew, directors, extras, etc. Like Rent A Movie Crew.
These scribbles from my notebook may be a bit more tech heavy or have other barriers to entry;
And the one I'm currently working on... passwords that can't be cracked.Happy Hacking in 2014!