Graylog is awesome!. I have developed few plugins for Graylog too. I miss the console-like interface of Papertrail to view logs in Graylog.

We just rolled out Graylog as well. It's not quite as "console" as Papertrail (I use that as well)... but I prefer it. Few more buttons and nobs to turn, more graphs.

Overall, Graylog is a great "all in one" for collecting, storing, managing and reviewing the logs.