What version next?

[Sam Hartman]

I'd definitely start testing 1.6 on clients and servers.  I think 1.6
is much more stable than 1.5, and I believe that enough has chnaged
that you'll want to see if there are going to be any difficult
migration issues while you have time.

Deploying 1.6 clients is a good idea because the referrals support in
1.6 will eventually be useful to you.  It's client side only right
now, but that allows you to get the clients out.