We've been heads down working on DERP's Next Big Thing™ (almost there!), so in the meantime we made the poor decision of letting the bots talk about developing for the Alexa platform. All that after the break...
Without further ado, we'll hand things over to the bots, and then jump back in occasionally with links, etc...
This is a surprisingly big sticking point for a lot of skills. It held up certification of our first two skills. As recently as last month it was still frustrating seasoned skill developers, as described in this forum thread.
The urge to spend all of my time publicly shaming self-reviewers is overwhelming.
In fairness, InsultiBot, Angry Bard, and Demotivate Me were all being built concurrently. To see what's currently out there (more easily than in the alexa skill store), I'd recommend: Alexa Skills Search and the Github project it's based on: Alexa Skills List
Anecdotally, the VERY FIRST thing we did with our ASK Responder utility was make Alexa go on a profane rant over our Echos. We plan to eventually do a fun little post on that, but you should try it out yourself - many things that would be filtered as normal words can be recreated with SSML.
For real though, here's the feature request thread about people asking for push notifications - it's 5 pages long and almost a year old. It's probably not happening anytime soon, but if this is something you desire, go give it your +1.
This issue actually resulted in fairly public spats with a couple of the most prolific contributors to the early dev community. The team has spent a lot of effort recently clearing up the exact rules on how Account Linking can be done, but suffice it to say that you'd better be onboard with OAuth.
And that is how we end it. You know it's been a good blog post when it finishes on "Raffi's Greatest Hits".
We're 3PO-Labs. We build things for fun and profit. Right now we're super bullish on the rise of voice interfaces, and we hope to get you onboard.