Countdown to Firebird 0.6
After a long, long wait, the Firebird 0.6 milestone should be released any day now. You can follow the progress on the remaining few issues here
I'm using the latest nightly build now and it's the first I've seen that has "Firebird Browser" in the title bar instead of Phoenix. It's working pretty well as now - the new preferences screen (which has been in nightlies for a while) is a big improvement and I haven't encountered any stability problems yet.