This is an experiment in generating documentation.
The Linux-FreeBSD area is one where quite a few people might have some information, but not know everything.
Thus, a Q&A with answers from different people might work.
To participate, send a reply to this message (unfortunately the option to quote the original message when it comes up seems no longer to be available), answering some questions or adding questions (with or without answers).
At the end of each answer, add your name and email (if you like) (or title/position, if you want to) as a way to identify you as the contributor.
I'll post the results here and also send them to freebsd-doc, for consideration as a tutorial or whatever.

--Annelise Anderson (andrsn@andrsn.stanford.edu)

Questions

Can I install FreeBSD on the same hard drive as Linux?

If I install FreeBSD on the same computer on which I've got Linux, will Linux lilo work?

Can I share Linux swap space with FreeBSD?

Will I be able to mount Linux file systems under FreeBSD?

Can I run Linux binaries on FreeBSD? What about the ones I've installed on Linux--can they be moved or run from FreeBSD?

Are there any configuration files I should migrate from my Linux installation to FreeBSD?

--data files (programming, text files, and so forth)

The command line doesn't seem to be working very well. What's wrong?

[You're used to bash, and now you have sh or csh without your old configuration files. Install bash, configure.]

Is adding users and establishing accounts able to su to root the same in FreeBSD as in Linux?

What about the system and user crontabs--same deal?

Configuration files in /etc (primarily)--what's the same, what's different?

/dev: different names for things? Otherwise same commands, e.g., mount, dump, etc. where device names are needed?

Do gcc and cc work the same under FreeBSD as they do under linux?

Can I play quake from FreeBSD?

Does FreeBSD run ELF binaries? (Is that the right question?)