Thanks for posting this question here kgrin. I'm one of the co-founders of BillMonk, and like you, am disappointed to see that the service is down without any warning or follow up information.

I haven't been at Obopay since late 2007, so don't have much knowledge about how BillMonk is being handled today. However I reached out the company and will be speaking with them this week. I can't promise that there will be any sort of resolution, but I will strongly encourage the company to (a) clearly communicate to users about what's happening with the service on the BillMonk blog (outage or shut down), and (b) if the plan is in fact to shut down BillMonk, to provide users with a way to export their data.

Please check the BillMonk blog (http://blog.billmonk.com) over the next week or two for updates - hopefully the company will post an update there. I'll also monitor this post to answer any follow up questions.