Tip: At least for me (on a Mac), running Arc with "[racket|mzscheme] -f as.scm" and then hitting ctrl-C at some point will kill the whole process, instead of dropping to a [Racket|Scheme] prompt from which I can use (tl) to return to the arc> prompt. Replacing the command with "[racket|mzscheme] -i -f as.scm", -i for interactive, fixes this. Much better.
I used to have 'cd ~/Dropbox/arc3.1;' before the 'rlwrap ...' part; the aload function and all the Arc files that load other Arc files (libs.arc) assume that you're in the Arc directory. I worked around this by wrapping all the calls to 'aload in as.scm like this: