"nudges me slightly more to consider open-source alternatives" Right. While it was certainly unfortunate that Posterous was acquihired the impact from a saas/p

"nudges me slightly more to consider open-source alternatives" Right. While it was certainly unfortunate that Posterous was acquihired the impact from a saas/paas closing would be magnitudes more disruptive. Everyone comes across as a winner and doing well with no chance of going under until it happens. Imagine building something using mailgun,appfog, engine yard or (pick whatever you want) and then having to scramble (even over the course of several months) to try and replace the functionality.