We all know SimpleGeo was a failure. It doesn't count as an acquisition. It failed, and the founders moved on to Urban Airship.
One poster said most companies that get acquired are shut down within the year (http://news.ycombinator.com/item?id=3458414). This appears ridiculous on its face (or there needs to be a mass migration from Heroku), but what other symptoms should folks have been looking for here? I'm interested in objective measures that one might reasonably use in evaluating vendors. I'm specifically not interested in things like how many/few job postings they run on Stack Overflow, the chatter at the last San Jose Ruby Meetup, VC blog posts, etc.