I guess it really depends on how you view the use of your applications ... I personally would like a better integration between my email client and my development environment (and my browser) for things like sending code examples, references to source, etc. It's all sort of where you draw the separation line -- does running in a separate window make them separate apps?
On the crashing point, seems like we should all be against bad software rather than questionable integrations
Personally, I just want to use the best app for the job, and for the next 5 minutes, Opera's looking like it. I'll post tomorrow that something about it infuriated me and I've moved on in my lonely quest to not hate every piece of software.
ms