Didn’t see that one coming. I use Instapaper every single day, and I hope this keeps Instapaper around for a long time and frees up Marco to make more new stuff. From his post:

I’m happy to announce that I’ve sold a majority stake in Instapaper to Betaworks. We’ve structured the deal with Instapaper’s health and longevity as the top priority, with incentives to keep it going well into the future. I will continue advising the project indefinitely, while Betaworks will take over its operations, expand its staff, and develop it further.

I’ve been in a similar place before; having a successful project that can continue growing but needs a bigger team and more resources, but you don’t want to make it your entire career. Marco, it seems, felt similarly before he made the decision to sell.