As a practical matter, it will be a while before I jump to 3.0. I am almost entirely on Rails 2.3.5 and Ruby 1.9.1 and that is working for me. Really it is a tradeoff between working at 100% speed right now or spending some time migrating to better tools.
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I've pretty much switched everything to Ruby 1.9.1 and the first Rails 3.0 beta. Works like a charm. That's why I was so disappointed to see the 3.0pre2 rely on Ruby head rather than current Ruby stable (1.9.1).
As a matter of general principle I agree with this, but I've had so many problems with 1.9.1, I moved to 1.9.2-pre, and it's been working a lot better.
What kind of problems did you have with 1.9.1? What was your deployment stack?
ashleyw has a good comment about this further down:
Is beta 3 working on Ruby 1.9?
I would tell you to read the manual, but they didn't post release notes on the rails blog this time!
Anyhow, Ruby 1.9.2 is recommended.
I got a segfault on Ruby 1.9.1-p376. Check the release notes/blog post of Beta 2 - I think those same restrictions apply.
My apps are all 2.3.5 with REE, so I'm waiting for the 3.0 release to move to Ruby 1.9. Why bother doing two upgrades when I can just do one big one?