Tim:
I can't say that I've noticed it crashing a lot. Or even crashing at all, since about the Fedora 9 era.
Patrick O'Callaghan:
I wish. Evo is my main MUA (and I only use it for mail). It does crash and hang a lot less than it used to but I couldn't in all honesty say it never happens. In fact the latest update just segfaulted twice in a couple of hours (evolution-2.28.3-1.fc12.x86_64).
I can't recall a crash for a very long time. But maybe that depends on what you're doing with it. I really only use it to access my local IMAP server to read mail, and respond. I don't use any of the special features, beyond the spell checker. And I don't leave it running all the time.
The upcoming Big Change is to throw out all the Bonobo stuff, which promises sunlit uplands and jam tomorrow. Let's hope so.
Here's hoping...