http://libbitcoin.dyne.org/servers.html

Anyone with Obelisk servers send me your details, and lets get a good list
going there.

I encourage upgrading to the released versions now. You will have to
re-download the blockchain, but it should be much quicker now. You can
even spawn a parallel worker if you don't want to stop your current
instance.

The config file in /etc/obelisk/worker.cfg can be copied elsewhere and you
can startup the daemon with a different config by passing it on the
command line:

:worker2/ $ obworker worker.custom.cfg

I've added comments to the config files:

https://github.com/spesmilo/obelisk/blob/master/src/balancer/balancer.cfg
https://github.com/spesmilo/obelisk/blob/master/src/worker/worker.cfg

It's safe to put in a fake port for the worker so it runs isolated while
it's catching up the blockchain. But you'll have to manage different
versions of Obelisk so a little downtime while you upgrade is the easiest
option.