We'll be using MonoDevelop on a daily basis! I've been already using it for the last months, but the new release makes it easier than ever to move new people into it.
Now it has full debugger capabilities, and we were using it today to develop and debug new code of our plastic scm server.
I'm extremely happy to count on this tool on Linux, it's been a while since we decided to stick to mono, and this is really a huge step ahead. I can already see we'll have (sooner or later) a debugger running on Solaris and MacOS, and then Mono will shine even more than it currently does!
Now we have to develop an integration with MD! :-)
We are planning on releasing a preview of it at TechEd in May.